John Palmer guides you through brewing this delightful beer, that is widely praised but far too often poorly replicated. John Palmer guides you through brewing this delightful beer, that is widely praised but far too often poorly replicated. pitch
John Palmer guides you through brewing this delightful beer, that is widely praised but far too often poorly replicated. John Palmer guides you through brewing this delightful beer, that is widely praised but far too often poorly replicated. I used to do a talk titled "Embracing Homebrewing" (here it is on the Beersmith Podcast). Basically, rather than worry about replicating the exact process/results of a craft brewery, enjoy the things that you can do on a small scale without regulatory oversight (dosing in spirits, ice distillation, foraging) or economic pressures (expensive ingredients, not worrying about extract efficiency) etc.
The more great brewers I talk to... the more I realize that Scott and I run Sapwood Cellars like a big homebrewing operation more than a small craft brewery. We're lucky that we have enough support and direct sales that don't have to worry too much about cost, time, or efficiency. This post dives into that a little deeper on the benefits of inefficiency using the six beers included in the upcoming shipment of our Out-of-State Shipping Club as examples!
Variability: Flemish Gothic
Most mixed-ferm breweries have a single house culture they pull off a tank or set of barrels or a specific commercial microbe blend that they add to every batch of a given beer. It makes a lot of sense, it promotes consistency and you don't have to worry about blending/attenuation. However, for me it lacks the dynamic flavor options and variety in finished beers I love. Every time we brew a new sour base beer, we select a barrel with a culture that suits it, and add some to primary (along with a healthy Saccharomyces pitch).
Flemish Gothic is a beer we blended from three different wine barrels, with three different base sour reds (Standard Red, Provisional Strength, Vin De Céréale) each with a different culture. That allowed us to dial in the acidity, malt balance, and level of Brett expression. It worked out that we did a three-year blend rather than the standard old/young blend done by Rodenbach and many other Flemish Reds.
Flemish Gothic Tasting Notes
Smell - Real range, right from the start. Honey, leather, blackberry fruit leather, some dried hay of hops. Cocoa, Tootsie Pop. I could see Balsamic, but without the vinegar or nail polish.
Appearance - Beautiful ruby red. Good clarity. Stable off-white foam, pours three fingers.
Taste - Bright lactic acidity, with dried cherries in the finish. No acetic harshness in the finish. Mild perceived fruity sweetness. A little damp oak, but not aggressively woody despite the extended aging thanks to the well used barrels. Could have even used a little more. Slight licorice as it warms.
Mouthfeel - Medium body, pretty smooth. Firm carbonation. Slightly oaky astringency.
Drinkability - Really good, lots of malt/barrel/Brett character all working together without excessive acidity. One of my favorite sours we’ve done, right up there with Growth Rings. I’d like to blend something similar again in a few years.
Changes for Next Time - A few people suggested more acidity, but I like it as is. It’s considerably more acidic than my recollection of Flemish Kiss from Commons. I’ll be looking forward to seeing how this one ages.
Effort: Gindicators 2024
Local in-season fruit is less expensive than buying IQF or Puree. What you are paying for with those is convenience and consistency. Buying locally requires figuring out who grows good produce, building relationships, and being on top of communication. For Gindicators, we sourced peaches, nectarines, and apricots as the summer progressed. I picked through them each day, processing and freezing the fruit that was ripe. Waiting on the rest. It's worth it for me to go that extra length to create the best stone fruit aroma possible!
We paired that with a low-acidity (higher hoping rate) pale base aged in gin barrels. Stone fruit in general and apricots in particular bring a lot of their own acidity. After refermentation we blended in a 30 gallon "double gin-barrel-finished" higher-acid beer to add more gin character.
Gindicators 2024 Tasting Notes
Smell - Funky nose, damp hay Brett. As a result, it reads more saison-ish than our sours usually do. Melds in a fun way with citrus and rosemary notes from the barrels. Plenty of stone fruit, yellow peach especially, but leaves room for the other aromatics. Pez candy. Overall vibrant and varied.
Appearance - Mild haze, bright yellow body. Sticky white head, good density. End of the bottle pour has some small yeast floaties. Seems like more yeast adhered in the bottle than usual too. Maybe the 58W3 from refermentaiton?
Taste - Snappy acidity (malic?), glad we selected lower acid barrels for this one! Tastes more acidic than the >3.5 pH suggests. Lots of fresh apricot and nectarine on the palate. Minimal sweetness. Juniper comes through in the finish, piney, Sprite-like. Faint bitterness from the higher IBU component in the blend.
Mouthfeel - Firm carbonation. Light body, but not tannic or harsh despite the extended aging.
Drinkability - The acid level is just about right for my tastes, lingers for a second, but then goes.
Changes for Next Time - Not much to change on this one. I could be tempted to go up 25% on the fruit, it had a little more punch before we blended in the last 30 gallon gin barrel. Likely wasn’t necessary to repitch yeast so soon after refermentation on the fruit?
Process: Neologism 2024
We treat our sour beers with the same care and attention to sanitation and oxygen ingress as we do our Hazy IPAs. We purge the barrels and bottles with CO2, we fill the blending tank with water and push it out to remove all of the oxygen before transers. I think it really shows with the "vibrancy" of the aromatics we are able to achieve, especially in a dry hopped sour like Neologism. It goes into the blending tank on hops, and infuses cold for 48 hours before bottling. Since we can't do a water push out with the hops in there, we do the push out, then add the hops while purging with CO2.
The only previous batch of Neologism was named to Craft Beer & Brewing's Top 20 of 2022... that was the only beer we ever entered into a contest of any type!
Neologism 2024 Tasting Notes
Smell - Expressive in the nose with the gin shining. Spruce tips. Barnyard. Hops aren't as "raw" as an IPA, but it is still fresh smelling.
Appearance - Head is great (dense, long lasting). Slightly hazy golden.
Taste - A little of that guava thing from the first batch is starting to come through, awesome. Pleasant acidity, tart, but not harsh. Gin is a little more savory-herbal than previous gin beers: rosemary, spruce, bruised basil. A touch of oaky-vanillin as it warms.
Mouthfeel - Light astringency, firm carbonation. Light body.
Drinkability - I think this one will continue to improve as the edges soften and the hops integrate more. Still wish we could get more of those McClintock Reserva barrels, but even the second use one really helped this one!
Changes for Next Time - On point! Not this beer… but would still love to do a Tangerine-Gin and/or a Guava Gin at some point.
Risk: Honeymoon SZN
We try a lot of different things that "sound like a good idea." It would certainly be easier and more reliable to pick a slate of brands to make every year. We do rebrew/blend the same beers occasionally, but we don't have a firm schedule and we always try to leave room for inspiration based on what barrels, ingredients, and flavors we have available.
For Honeymoon SZN we started with a collab we brewed at Olde Mother Brewing (Frederick). Wedding SZN was a rice ale with Nelson Sauvin, elderflowers, and Phantasm (along with a natural thiol-releasing yeast strain). We racked it to white wine barrels and let the resident culture work. I sourced muscadine/scuppernong grapes (indigenous) through a local farmstand that has a relationship with a grower in South Carolina. I knew it was a good idea from the aroma of my car on the way back - halfway between Nelson Sauvin and Strawberry candy!
Honeymoon SZN Tasting Notes
Smell - Muscadine really comes through. Lots of white grape juice. Some toasty-funk, but not a primary aroma when cold. Bridges the gap between the Nelson and Brett.
Appearance - Clear. Very pale yellow. Good thick white head that doesn’t last long.
Taste - Light acidity, even less than Life is Ridiculous. Good fruit character, unique, fresh. A touch of funky smoke in the finish I haven’t noticed before. No elderflower.
Mouthfeel - Bright, light, spritzy.
Drinkability - Good, could use a touch more acid, but it is very drinkable as is.
Changes for Next Time - Not sure muscadine is a star… would be fun with a light dry hop. Maybe with another fruit, stone fruit?
Time: Opulence 2024
We age our beers for a long time. Years ago I visited an established brewery that had just added a large barrel facility for sour beers. The brewer running it mentioned he had to meet a monthly production quota for packaged product. Just seems impossible for that to produce fantastic beer. Sometimes we go a month without bottling anything because the beer isn't ready yet... sometimes we are doing back-to-back runs because we don't want something to sit any longer! Opulence 2024 was supposed to be Opulence 2023, but the beer just wasn't ready for the cherries after 8 months in the barrel... but it was at 20 months! We had some leftover high-acidity beer from the previous batch of Opulence kegged off that we blended in with the "fresher" beer that was aged in second-use Cherry Brandy barrels.
Opulence 2024 Tasting Notes
Smell - Reminds me of my homebrews (in a good way). Funk (leathery) really comes through along with cherry and almond. Cherry is really fun, lots of cherry pie, vanilla, and depth. Nothing weird from the cherry brandy barrels considering the previous use was Imperial Stout.
Appearance - I wish the clarity was a little better, but the color is a pleasant amber-orange. Great off-white head.
Taste - Mild acidity, could be a little higher. Detectable bitterness (maybe a hair high). Good cherry flavor, sour cherry pie, vibrant.
Mouthfeel - Light astringency, which is disruptive to the smoothness. Firm carbonation, medium-thin body.
Drinkability - It’s solid. I like the lower acidity compared to past batches, but the bitterness gets in the way.
Changes for Next Time - I wonder if aged hops rather than fresh in the whirlpool would work without providing any weird aromatics? I really like what the Saaz in the whirlpool did for the aroma and balance (lower acidity), but the bitterness clashes with the acidity in flavor… despite being “only” 19 IBUs. Maybe better to go with some alpha acid extract in the tank?
Equipment: Stained 2024
One thing that has worked out well for us is having smaller equipment. Rather than be forced to do big blends, we have equipment that is sized for flexibility. For example, with Stained we age it on wine grapes and raspberries separately. I'm sensitive to the "seedy" flavor that comes from long contact time with raspberries... but I also enjoy the deeper flavors of extended skin contact on grapes. So for this batch we kegged off the raspberry half after two weeks, while the Merlot grapes continued aging for another month until we liked the flavor. This plays into having the time to taste and adjust the production schedule.
Stained 2024 Tasting Notes
Smell - Berries, especially raspberries… go figure. Certainly reads Flemish Red, Rodenbach etc. rather than Lambic thanks to no big funk/rubber.
Appearance - Bright red, thin off-white head drops quickly. Good clarity, but not brilliant. Very attractive.
Taste - Raspberry popsicle, very bright. Suggestion of sweetness from the fruit and malt. THP has cleaned up. Jammy, not overtly malty, but it fills in the fruit. Firm acidity, no harshness. Wine is subdued, but layers complexity and roundness compared to straight raspberries. Clean, not much funk although there is some earthiness. Oak is subdued thanks to third-use barrels.
Mouthfeel - Medium-light, firm carbonation. Not thin or watery, helps support the fruit.
Drinkability - Good, plenty of acid for my tastes, delicious fruit. Could be a little more interesting microbially, but it works in the Flemish tradition.
Changes for Next Time - Could shift more towards the Merlot? Surprised how much acidity it picked up despite the alpha acid extract in the tote.
Out of State Shipping Club
If you are interested in tasting these beers, please sign-up by 10/28! You'll be charged $146 to your card on file and expect to receive your beer the first week of November! Available in: WA, CA, OR, NM, NV, CO, MN, NY, DC, CT, NE, MA, FL, PA, NH, NJ, ID, TX, KS, IN, WI, MO, IA, IL, MI, ND, VA, RI, NC, and SC.
Includes one 500 mL bottle each:
Gindicators 2024: Gin-barrel-aged pale sour with Peaches, Nectarines, and Apricots
Flemish Gothic: 3-year Blend of Wine Barrel Aged Sour Reds
Opulence 2024: Sour Red with Fresh and Dried Sour Cherries aged in Cherry Brandy and Bourbon Barrels
Neologism 2024: Gin-barrel-aged and Mosaic Cryo Dry Hopped
Stained 2024: Wine-barrel-aged with Raspberries and Merlot Grapes
Honeymoon SZN: Wine-barrel-aged with Phantasm and Muscadine/Scuppernong Grapes
The Chair has become the shaker pint of taproom furniture: ubiquitous, affordable, stackable, easy to clean, and largely unloved.
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This week I take a look at fermentation considerations when brewing a very high gravity beer such as an Imperial Stout or Barley Wine. Last week in Part 1, I covered several methods for achieving a very high starting gravity. Selecting Your Yeast Now that you have a high gravity wort, you need to consider […] 
This week in part 4, I cover common beer infections including wild yeast and bacteria as well as some equipment and material concerns related to cleaning and sanitation. In Part 1 I provided an introduction to cleaning and sanitation and explained why it is a two step process. Part 2 covered cleaners for home brewing […] 
This week I cover the topic of osmotic shock in yeast, and how it can impact the fermentation performance of very high gravity beers, meads, wines, and concentrated seltzers. Osmotic Shock in Yeast Cells I had never heard of the term osmotic shock until I started making very high gravity meads. Some of my large […] This is the second in a series of posts each covering an aspect of brewing mixed-fermentation barrel-aged beers where my opinions have changed significantly since I wrote American Sour Beers 10 years ago. Each post will focus on our process, recipe, and results for one of the beers in the Sapwood Cellars Shipping Club (includes 6 bottles, for $146, cancel anytime) - sign-ups for the first box close May 5th! This post covers blending through the lens of Growth Rings 2023 (our blend of 1-, 2-, and 3-year barrel-aged sours). If you are closer to the brewery, May 10th and 11th I'll be doing a talk and vintage sour tasting including pours of Growth Rings 2021 and 2023!
As a homebrewer, my experience with blending was limited to a handful of batches. Over the last six years I've had a hand in blending more than 70 batches of barrel-aged sour beer. So, I thought it would be valuable to give my thoughts on the process, what I've learned to do, and not to do.
Setting Yourself Up For Success
You can't blend great beer if you don't have options. Creating variety starts on brew day and continues through fermentation and aging.
Malt Bills - More so for darker sours, it's good to have options for beers that have different flavors to pull from. Even for pale beers, having different grains (wheat, oats, rye, spelt, light caramel malt etc.), and starting gravities can be valuable for creating range.
Hopping Rates - As I discussed in my previous post, hopping rate plays a large role in acidity and "funky" aromatics. Bitterness itself can be a valuable flavor in a blend, it's a flavor present in most lambics, and too often missing from American sours.
Acidity - Having "Brett only" barrels is a good way to ensure you have beer available that won't be too acidic. When a barrel starts getting too sour, we'll often keg it so it is available for blending at a low level for beers that aren't sour enough.
Barrels - A blend of "new" and well-used barrels. Early on all of our barrels were first-use (to us). As a result many of our early releases were too woody, giving "lumber aisle" vibes. Most sour beers are light and delicate and too much oak can overwhelm. At the same time, it's good to retire barrels that aren't producing spectacular beer allowing you to bring in new characterful barrels (we currently have fresh gin, Madeira, PX Sherry etc. aging). If I was starting a new barrel program, I'd soak half of the barrels slated for pale beers with multiple changes of hot water to leach out oak flavor and tannins before filling.
Microbes - It is easiest if you have the same culture in all of the beers/barrels. In that case you don't have to worry about additional attenuation after packaging. For me, it's more valuable to have a variety of microbes for different acid levels and Brett profiles for more dynamic flavor options. As time has gone on we've split the difference, pumping in some of a favorite barrel to a fresh batch, but then going into various barrels with their own cultures. We'll also pitch additional microbes if a barrel isn't headed in a good direction at 6-12 months.
Ages - It can be helpful to have the same/similar beers of various ages so you can balance flavors. We've gotten better at judging which barrels just need more time, and which are headed in a bad direction and need to be dumped. That said, I don't have as much time to taste/monitor the barrels as I should and I still "miss" some good barrels leaving them in too long until they taste oxidized or off.
The Mechanics of Blending
Think about the goals before you start. What is the concept? What other ingredients are you adding after blending? What is the target volume? Sometimes it is good to just taste barrels for inspiration, but that can be overwhelming when you have dozens of barrels to select from. I try to set a general schedule before the year starts. It keeps me on track for seasonal ingredients, sourcing barrels for finishing, and utilizing our staff/tank time rather than bunching up releases. I tend to earmark barrels as "potential" candidates for a blend, ideally twice as many barrels as a blend would require.
From there, I go to our barrel-spreadsheet (more info). I filter for beers with enough age, appropriate bases, removing barrels that are already earmarked for other projects. Lots of releases overlap, say I fill five barrels with sour red and hope to get a two-barrel blend plain and a two-barrel blend with fruit. Hopefully I have an "orphan" barrel that was passed over from last year or another similar base that didn't fit in its blend available for variety. Then I start pulling nails and tasting to gauge my options. I note barrels that need more time and those that are running out of time. Hopefully that narrows down my choices to five barrels at most for a two or three barrel blend.
Then I pull larger samples of those barrels so I have enough beer for a few blends without having to go back and pull more. When possible, I try to create full-barrel blends, although we occasionally keg-off partial barrels for future blending stock. In the same way if a blend is missing a little something, I'll take a look through our kegs and see if there is an option that satisfies the need.
I usually break down my options by acidity. If two barrels are a bit too acidic and two are not acidic enough, I'll try blending my favorite from each camp together to see where that gets me. Then swap in the other if there is something that doesn't work. Once I get a solid blend, I might go hunting for a little something extra. For example we were just blending a sour red, and ended up with a little 3+ year-aged Vin de Cereale (strong sour red) as a low-percentage malt-booster bringing perceived sweetness and more oak.
In terms of the practicalities of blending, I usually use volume. Weight works, but I tend not to worry about extreme precision because the volume in each barrel can differ by 5-10% anyway. For each blend I start with an empty cup to avoid issues with tracking when you take a sip, dose in more and then don't really know the ratio.
Finally, I write down the winning blend. When possible, I come back and taste the blend on a fresh palate later, ideally with someone who wasn't involved in the initial blend (since that is how the majority of people drinking the beer will approach it).
Blending takes time and practice, but one thing that has been immensely helpful is blending with other people. Some of my favorite collabs are sensory rather than recipe-based. There isn't often much I get out of brewing a collab beer, instead we invite in other brewers to taste through our barrels and help select a blend, brainstorm adjuncts etc. Sam, Tim, and co. from Other Half helped blend Throwing Hearts. Jennings from Pen Druid came in to blend Life is Ridiculous. Mike Thorpe from Afterthought visited last week to blend an upcoming beer with hardy kiwi and New Zealand hops. We've done similar things on the stout side with Mike Saboe from Toppling Goliath and Eric Padilla from More/Open Outcry. Heck it's just great bringing in homebrew friends with good palates to help taste barrels, bounce ideas off... and just give me an excuse to pull samples!
Recipe: Growth Rings 2023
Barrel #16
Beer: Golden Sour (Pils, 2-row, Chit, Wheat Malt, .5 lbs/bbl Aged Hops, 1.056)
Age: 16 Months
Barrel: 5th-fill Pinot Noir American Oak
Culture East Coast Yeast Flemish Ale
Notes: Rubbery funk, medium acid, bright, good
Barrel #19
Beer: Rings of Light (2-row, Chit, Malted Wheat, Unmalted Oats, 40 IBUs in Whirlpool, 1.062)
Age: 8 months
Barrel: 4th-fill Chardonnay American Oak.
Culture: Omega Brett C and Yeast Bay Amalgamation
Notes: Less acidic, funky, bright fruit, rubbery
Barrel #20
Beer: Marylandbic (Pils, Unmalted Wheat, Chit, .5 lbs/bbl 2014 Celeia pellets, 1.045)
Age: 35 months.
Barrel: 2nd-fill Chardonnay American Oak.
Culture: Omega Brett C and Yeast Bay Amalgamation (plus a house culture that was a repitch of a repitch in primary)
Notes: Loamy, a touch stale, bright lactic acid.
Barrel #62
Beer: Belgian Pale (Pilsner, Wheat Malt, Vienna, 15 IBUs Sterling First Wort, 1.048)
Age: 27 months
Barrel: 2nd-fill Cabernet Franc French Oak
Culture: SARA Saison Bernice
Notes: Sprite, tart, but not highly acidic.
Growth Rings is the rare bottle-conditioned sour that we didn't repitch with wine yeast, a good choice if you're looking to harvest bottle dregs!
Tasting Notes: Growth Rings 2023
(My personal notes from a few months ago)
Smell - Citrusy nose, apricot, hay, bright and fresh. Missing that big rubber that is present in most great lambics.
Appearance - Pale gold, clear, lots of bubbles, thick head, good retention. Great lacing.
Taste - Delicate acidity. Lemon, apricot, just a touch of rubber.
Mouthfeel - Snappy carbonation, medium-light body. Lighter bodied than a classic Gueuze.
Drinkability - In terms of drinkability, it’s my favorite recently. Lively, complex… but it isn't as gueuze-y.
Changes for Next Time - It has sort of a barrel-aged saison quality more than gueuze. Maybe that fresher whirlpool hop character from Rings of Light… that said I really like the result.
Quality matters at any size brewery, and the team behind beer quality is what matters most since data doesn’t analyze itself.
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This week I take a look at yeast autolysis which is the decomposition of yeast, and how it affects beer flavor as your beer ages. Yeast Autolysis The word autolysis literally means self-destruction, and yeast autolysis is the final stage for a yeast cell life where the yeast cell wall literally bursts open and releases […] The Brewers Association Mentorship Program has successfully finished four cohorts. Selected participants complete a 12-week program with mentors from various parts of the industry.
The post Pursuing a Passion: Mentorship Program Fuels Participants appeared first on CraftBeer.com.
Thiols are the coolest thing in brewing hoppy beers since the invention of dry hopping. It seems like almost every collab Sapwood Cellars has been invited to brew over the last 18 months ends up "Thiolized": 3S4MP (Cosmic Punch IPA with Phantasm and Nelson Sauvin at Fidens), Cone Concentrate (Cosmic Punch DIPA with Simcoe at Other Half DC), Celestial Paradox (London Tropics IPA with Strata/Galaxy/Citra/Simcoe at Toppling Goliath), Yasokeee (Helio Gazer DIPA with Peacherine, Hydra, and Phantasm at Cushwa), and most recently Heisenberg (Helio Gazer DIPA with Galaxy/Nelson at Commonwealth).
So why all of the excitement from our fellow craft brewers? Obviously many of the collab requests are due to Scott's writing about and advocacy for thiols, but are they just something new that will be passé soon, or are these strains here to stay?
So why all of the excitement from our fellow craft brewers? Obviously many of the collab requests are due to Scott's writing about and advocacy for thiols, but are they just something new that will be passé soon, or are these strains here to stay?
What Are Thiols?
Thiols are sulfur-containing compounds that are often potent aromatics. The ones brewers are excited about are tropical, winey, and citrusy, while other thiols are intensely unpleasant with aromas of garlic or rotten eggs... which is why the thiol mercaptan is added to natural gas to alert people to leaks. The "skunky" aroma of light-struck beer is also 3-methyl-2-butene-1-thiol.
Unlike many other beer aromatics that require concentrations in the ppm (parts per million) or ppb (parts per billion) many thiols have an aroma threshold in the range of 5-70 ppt (parts per trillion). This means that it doesn't take much of them to be apparent, but also means that it doesn't require "high" concentrations to become dominant.
In terms of positive beer and wine aromatics, the thiols that get the most attention are 4MMP, 3MH, 3MHA, and 3S4MP. These have perceptions that range from passionfruit, to grapefruit, to rhubarb. These are the intense aromatics that give New Zealand Sauvignon Blanc wines their distinct aromas and are found free at low-levels in many New Zealand hops (as well as some other varieties from around the world).
Most of the thiols found in hops, malt, and other botanicals are bound and thus not active aromatically. Enzymes are required to free them. There are wine strains available capable of this, but getting those genes into brewer's yeast requires more work.
Where Do Thiols Come From?
Bound thiols are found in both malt and hops, but levels vary widely. The bond in need of breaking comes in two "flavors" Cysteinylated (Cys) and Glutathionylated (Glu). The vast majority (90%+) in both malt and hops is Glu. The IRC7 gene in certain wine strains and Omega's Cosmic Punch can only work on the less common Cys. As a result, mash hops are most potentially beneficial for Cosmic Punch, as the enzymes in the mash (especially in the acid-protein rest temperature range) can help convert Glu to Cys. Luckily some less expensive hop varieties have the highest levels of bound thiols. We've used Saaz, Cascade, and Calypso with good results.
The more intense strains like Berkeley Yeast Tropics line and Omega's Helio Gazer, Star Party, and Lunar Crush can simply be added to a standard recipe with or without whirlpool hops. Rather than having more copies of the IRC7 gene, they have a wholly different gene which can free Glu-thiols directly. The IRC7 gene in Cosmic Punch is "sourced" from yeast, while patB Omega uses in the more assertive strains is from a bacteria (if transgenic CRISPR/Cas9 gene modification is a step too far for you). We fermented a kettle sour which only had a small dose of hexalone (isomerized hop extract for head retention) with London Tropics. The result was intensely passion-fruity, so much so that it could almost pass a fruit beer.
GM (genetically modified) yeast strains aren't allowed in commercial beers in many countries (e.g., Canada, New Zealand). As a result there are labs working with wild isolates capable of freeing thiols for co-fermentations (e.g., CHR Hansen - it is primarily marketed for NA beers) and breeding strains with heightened thiol freeing capabilities (e.g., Escarpment). Omega initially worked on yeast breeding between English ale and a wine strain capable of freeing thiols... our trials with it (Designer Baby) were interesting, but had too much of the wine strain's idiosyncrasies present (poor flocculation especially).
Pros & Cons of Thiol-Expressing Yeast
Pros:
-Intense aromatics that are otherwise impossible to achieve from hops, malt, and yeast
-Thiols have incredibly low aroma thresholds... measured in ppt (parts per trillion)
-Thiols are "free" no expensive hops or fruit required
-Thiols may help increase shelf-life by scavenging oxygen
Cons:
-Higher perceived "sulfur" aromatics are frequent in thiol-freeing strains
-Some brewers/consumers/countries prefer to avoid GM ingredients
-Thiols can be "one note"... is it really that different from adding a jar of passion fruit extract?
-Repitching the yeast doesn't make as much sense if you also want to brew English Ales, Porters/Stouts etc.
More isn't (always) Better
Initially there was a focus on maximizing thiol concentration. This could include colder fermentation temperatures, mash hops, and engineering strains with more assertive genes. Like most aspects of brewing (or cooking) maximizing a single flavor compound doesn't usually result in the best overall flavor or balance.
Thiols aren't typically a "primary" aromatic in beer, so a beer with over-the-top thiol concentration without anything to play off of can taste artificial. On the other hand, some of our heavily dry hopped DIPAs have tested at over 100X the flavor threshold for 3MH and still weren't the primary aroma thanks to competition from the "traditional" hop aromatics. From those test, I wouldn't worry about dry hopping removing all of the thiols.
As a general rule, I'd suggest using a more restrained approach to thiols in lighter/cleaner/simpler beers. It doesn't take much to add a unique twist to a lager or American wheat, where a double-dry-hopped DIPA or fruit beer may benefit from a much higher amount. In the end it's about your palate and goals for a beer.
In my experience expressing thiols doesn't make every hoppy beer better. They add a distinct note that can greatly enhance the perception of passionfruit-type aromatics. That is a wonderful contribution when you are leaning into those flavors, but can be distracting or muddle other flavors. For example, I love the "mango popsicle" aroma of great Simcoe. However, with one of the intense strains like London Tropics or Helio Gazer in an all-Simcoe beer can become more generically "tropical" rather than varietal "mango." On the other hand, when dry hopping with passion-fruity Galaxy, or brewing with actual passionfruit the thiol note helps to enhance the existing aromatics.
Phantasm
Hand-in-hand with thiol-expressing yeast goes Phantasm. It is essentially the dried and powdered remnants of the highest-thiol New Zealand Sauvignon Blanc grapes. As a result it comes with a high price-tag of ~$35/lb. It really doesn't smell like much before fermentation. Added to the whirlpool it adds a huge amount of bound thiols for the yeast to work on.
During fermentation I detect a distinct "white grape" flavor and aroma that I don't get from other thiol-expressing ferments that rely on grain and hops alone for bound precursors. A lot of this drops out with the yeast however and the finished beers are rarely as distinct. To my palate the added expense is hard to justify in a highly-dry-hopped beer where the thiols are competing against other big aromatics. Unless you lean into those aromatics with a hop like Nelson Sauvin. I like Phantasm best when it is paired with actual white wine grapes, or in a simple base where it can star.
We haven't used Berkely Yeast's "Thiol Boost" additive yet... but I'm just not that excited about a 15X increase on the already intense London Tropics level of 3MH. I'd be interested in herbs or additives that could push other unique thiol aromatics that we aren't getting from grain/hops.
My Favorite Thiolized Batches
At Sapwood Cellars, we've brewed a few dozen batches between Cosmic Punch, London Tropics, Lunar Crush, and experimental isolates. I've enjoyed most of them, but a handful stand-out as beers I loved!
Cosmic Rings: Galaxy and Citra is one of our favorite combinations... but we have had a difficult time sourcing great Galaxy (that doesn't taste like honey roasted peanuts). This all-Citra double-dry-hopped pale ale starts with New Zealand Taiheke (Cascade) in the mash and kettle. It's one of our favorite whirlpool hops because it is low alpha acid and has a beautiful tropical aroma... not to mention a lower price compared to other New Zealand varieties like Nelson Sauvin and Riwaka. Then we ferment with Omega's Cosmic Punch which brings some tropical aromatics without becoming distracting or artificial. Finally we dry hop with Citra and Citra Cryo at a combined 3 lbs/bbl.
Tropical Pop: Kettle sour fermented with Berkeley Yeast London Tropics along with passion fruit and mango purees. Passion fruit is expensive, fermenting with London Tropics boosted the passion fruit aroma allowing us to use less without sacrificing the aroma intensity.
Field Learning: As a homebrewer I loved being able to dump a bottle of thiol-rich New Zealand Sauvignon Blanc into a keg of mixed-ferm saison. That wouldn't be legal commercially, but what we did for this collab with Bissell Brothers was to brew a restrained base with Hallertau Blanc in the mash and Phantasm in the whirlpool and age it in fresh Sauvignon Blanc barrels along with Bissell's house culture. After a year we added fresh Chardonnay grapes from Crow Vineyards here in Maryland. The tropical notes from the thiols survived barrel aging and gave the beer depth we wouldn't have gotten from grapes and barrel alone.
Takeaways
Are thiols a scam? No, but they also aren't an innovation that fundamentally changes what it takes to make a delicious beer. Consider a thiol-freeing yeast when additional passionfruit-type aromatics will enhance your beer. Don't worry about maximizing the thiols unless you they will be competing against other strong aromatics.
I suspect that this is just the lead in to even more exotic genetically modified yeast strains (we have a pitch of Berkeley's Sunburst Chico which is modified to express high levels of pineapple-y ethyl butyrate). If you can produce a flavor compound without the cost, environmental impact, variability of growing it I suspect the economic pressures will be too great! That said, making delicious beers isn't about maximizing one or two compounds (in the same way that vanilla flavoring is inexpensive, but doesn't fully replace the depth and complexity of real vanilla beans).
This week I take a look at the recent trend towards lagers in Craft Brewing. While they certainly won’t replace IPAs in the US Craft Beer market, we’re seeing more finely crafted lagers entering the market in the past few years. Craft Lagers on the Rise IPAs continue to absolutely dominate the Craft Beer market, […] When it comes to brewing delicious beer, there are few aspects more important than the yeast. A healthy fermentation allows the malt, hops, and adjuncts to shine. Pitching the right amount of healthy cells helps ensure that the finished beer has the intended alcohol, expected residual sweetness, and appropriate yeast character.
Over the last four years at Sapwood Cellars we've slowly improved our yeast handling. We've noticed improved fermentation consistency, and better tasting beers. Most of our process is excessive for a homebrewer, but it might give you some ideas!
Harvesting Yeast
We harvest yeast from moderate gravity beers when possible as these cells are less stressed and healthier as a result. Our general rhythm is to brew a pale ale with a fresh pitch, and harvest from that tank for an IPA and DIPA the following week. Once the pale ale fermentation is complete (repeated gravity readings, and no diacetyl or acetaldehyde sensory) we can and soft-crash to 56-58F (13-14C). Cold and dissolved CO2 encourage the yeast to settle out. Specific temperature and time are strain and tank dependent, but that works for most of the English-leaning strains we use (Boddington's, Conan, Whitbread, and the Thiolized-variants).
Once the beer has been cold for 24 hours, we attach a 1/2 bbl brink to the bottom of the tank and pasteurize through the line and brink with 180F (82C) water from our on-demand. 25 minutes hot ensures there aren't any stray microbes that will be passed onto the subsequent batches. After pushing out the water with CO2 pressure we spray the brink with cold water then pressurize it and the tank to ~10 PSI.
We then dump about a gallon (4L) from the T until the yeast looks good (creamy, off-white) and then begin collecting into the brink. You don't need to dump a large volume of yeast. By keeping steady pressure on the tank and slowly releasing pressure on the brink through the valve at the top we ensure that the yeast won't come out of the cone too quickly (which could punch through pulling in more beer than yeast) and won't foam up in the brink. It takes 10-15 minutes to fill the brink. Usually we are able to collect 110-130 lbs (50-60 kg) before yeast starts coming out the top of the brink.
We collect yeast before dry hopping to avoid having hops mixed in with the yeast. We also prefer the "less rough" flavor we achieve by dry hopping cold. If you dry hop early-mid fermentation and want to harvest, drop as much of the hops out as you can before crashing and harvesting.
Yeast Storage
Whenever possible we pitch within 72 hours of harvest. Larger yeast cultures generate more heat and thus tend to lose viability more rapidly. Store the yeast as cold as possible, which for us is ~36F (2C) in our walk-in. Ideally that would be closer to 32F (0C) to further slow its metabolism. Shake twice a day to dissipate hot-spots and vent down the pressure to knock-out CO2. If storing the yeast for more than a few days, attach a blow-off line to prevent pressure from building.
There are studies about various additives for maintaining high yeast viability. We've added phosphate buffer to prevent a drastic pH drop. It's difficult to tell from a single data point, but viability dropped from 95% to 89% after a week of storage. We've seen closer to 10% reductions the handful of times we've stored yeast that long previously.
We generally won't harvest and repitch beyond three generations (although recently we went to five). That's because with our limited number of tanks, variety of yeast strains, and canning schedule we'd eventually have to hold onto yeast for a couple of weeks before pitching or harvest from a strong beer.
Determining Cell Count and Viability
There are plenty of successful brewers who pitch a standard weight by barrel/gravity, but knowing how many live cells you actually have is a great way to improve consistency. It's especially valuable if you use a variety of strains or want to bring in a new strain. Our harvests of the same strain can vary by as much as three times in terms of live cells per g of slurry (~.5-1.5 billion cells). The cost of all of the equipment required is ~$500, less than a single commercial 10 bbl yeast pitch from some labs.
Start by shaking the brink to homogenize the culture. Then run a cup of yeast out, dump it (to avoid counting the cells packed around the port) and then pull a sample. The next step is to dilute the culture to a "workable" concentration - 1:100 for us. Too many cells packed together makes for a culture that is impossible/laborious to count, while too few raises the chances luck will throw-off the count. For a long time I diluted by volume, performing two sequential 10X dilutions with a micropipette. This had two drawbacks. First getting an accurate volume of yeast slurry is tricky because it is foamy and has small bits of trub that can plug-up the pipette. Second, we pitch by weight, so there was always some estimation when it came to converting the volume to a weight or the extra step of determining the physical density of the slurry by mixing with water in a graduated cylinder on a scale. What we do now is dilute by weight, which gives us cells per gram rather than cells per milliliter.
Our scale is accurate to .2 g, so weighing 1 g of yeast into 99 g of water has a ~20% margin of error. As a result I do 490 g of water with 5 g of the yeast slurry. This reduces the maximum margin of error to ~4%. After pouring the diluted culture back and forth to mix, I take 9.9 mL of the diluted culture with the micropipette and add .1 mL of a stock dye solution of Erythrosin B and phosphate buffer (1 g in 50mL of buffer). This results in a total dilution of 100X. You could go even further, a 10X dilution by weight (50 g yeast with 450 g of water) followed by a 10X dilution by volume (1 mL of the diluted culture with 8.9 mL water and .1 g of dye). Live cells are able to expel the Erythrosin B so they won't be stained, meaning any red yeast cells are dead. You can use a variety of other stains, but Erythrosin B is a food coloring and much safer to handle than methylene blue or trypan blue. Here's a post from Escarpmant Labs on using it inspired by my Tweet (which was in turn inspired by this).
Luckily the Boddingtons-type strain we use for most of our batches isn't "excessively" flocculent. When we fermented a run with Whitbread we ran into issues with the cells being too clumpy to count. Luckily BrewKaiser has a whole post on additions you can add to help. Phosphoric acid worked OK, but a local brewer suggested disodium EDTA, which I plan to buy before we do another run with a similar strain.
Next, place a couple drops on the diluted culture a hemocytometer, apply the slide cover, and stick it under a microscope (we have an Omax). Count the live and dead cells in five squares (each made up of 25 small squares) - four corners, and center. This provides a large enough sample size to avoid undue randomness. A small tally counter helps keep track. The standard rule is to count cells touching the left and top lines, but not the right or bottom. Count connected cells as two only if the daughter cell is more than half the size of the mother. Then I plug the totals into Inland Island's Yeast Cell Count Calculator. Usually our harvests are 80-90% viable off a fresh pitch, and they tend to go up from there on subsequent generations (90-95%). If your viability isn't great it could either be that the yeast isn't getting enough nutrients/oxygen, your initial pitching rate was too high or low, or that you are waiting too long to harvest.
There are automated solutions for yeast counting, but with some practice the whole processes will take less than 10 minutes.
To pitch, we attach the brink to a T inline during knock-out. With the brink on a scale we use CO2 to slowly push in the desired weight of yeast (calculated based on the cell count, wort gravity, and volume). We pitch during knock-out so the yeast mixes with the aerated wort as it goes into the fermentor. White Labs advocates using a pump to pitch their fresh yeast inline to achieve better mixing with the wort. Best practice is to do another cell count off the tank once knock-out is complete to validate your process (we did it a few times, but now trust our approach).
When we started brewing more double batches to fill our 20 bbl tanks, we were pitching enough cells for 20 bbls along with the first 10 bbls of wort. Our thought process was that the yeast wouldn't do much in the 3-4 hours before the second half of the wort went in. However, we found our fermentations were less reliable, often dragging towards terminal gravity, and the yeast from those batches had much lower viability than expected. Both of these issues improved significantly once we switched to pitching only enough cells for the initial knock-out volume. This allows for more growth and thus a higher proportion of younger yeast cells.
Hopefully this overview of our process is helpful for someone starting a new craft brewery, or looking to take their yeast management to the next level. As with anything in brewing, the more variables you can track and control the more consistency you'll have in your results. Yeast management isn't a "fun" topic, but it is one of the simplest things a brewery can do to increase consistency, improve flavor, and save money!
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In part 2 of this series I will cover the traditional method for making sour beers. Last week in part 1, I covered Kettle Souring which is a relatively quick way to make many sour beer styles. Last week I covered the “Kettle Sour” method where you add the bacteria to your wort up front, […] This week I’m going to cover the two major methods (in two parts) used to create sour beers at a home brew level. While sour beer brewing is considered a more advanced brewing technique, it is possible for even a beginning homebrewer to create great sour beers using these methods. Sour Beer Basics Sour beers […] BBA T-SHIRTS ARE FOR SALE: http://www.betterbeerauthority.com/p/better-beer-authority-t-shirts_11.html CORRECTION: I mispronounced “wort”. It rhymes with “dirt”. And, “tun” rhymes with “done”. Learning how to brew beer using all-grain homebrewing methods. Kyle Klaibur, aka hophedbrewhaus, teaches me how. http://www.youtube.com/user/hophedbrewhaus Transcript: “Hi. I’m James Knott and this is your Better Beer Authority. Recently, I’ve been learning how to homebrew.