larger
While I love the pure expression of malt, water, hops, microbes, barrel, and time... fruit can make a fantastic addition to a barrel-aged sour. From a "sales" standpoint it is also easier to explain the difference between beers with fruit, than those with subtle differences in grain bill or microbes. Most people know they like cherries, plums, and raspberries... they may not know they enjoy horse blanket, minerality, or rubbery notes.
This is the third in a series of posts updating my thoughts from American Sour Beers ten years ago. The two beers featured below (Jammiest Bit and Fruit of Many Uses) were both part of the first shipment of the Sapwood Cellars Out of State Shipping Club. Memberships for that shipment are closed, but you can still sign-up now for the next shipment fall 2024 ($146/shipment including shipping). Bottles of both are still available at the tasting room!
Sourcing Fruit
I would almost always rather use fresh in-season local fruit over a puree, juice, freeze-dried, concentrate, and especially natural extract. Local produce tastes unique, meaning a beer that doesn't taste the same as one brewed on the other side of the country or by a larger brewery. You'll get a more complex character from having beer in contact with the stems, skins, pits etc. Working with farms, orchards, and vineyards "fits" the narrative of an artisanal product... making it look good on social media too! Not to mention our fruiting tanks (without conical and glycol jackets) work best with whole fruit rather than purees.
Talking directly to farms and orchards at farmer's markets is a great place to start. Tasting things, chatting about what sort of capacity (and excess) they might have. Sometimes you can get a good deal on seconds... but for me these often aren't worth it since it can take a lot of time and effort to sort them (going rotten before they are all ripe) and cut-out mold etc.
We've used IQF (Individual Quick Frozen) fruits several times with great results. For smaller batches I've just gone to supermarkets, found a product I like the flavor of... and bought out a couple locations. Online specialty purveyors like Northwest Wild Foods have weird things you might not find locally, like honeyberries. For lager batches we've ordered from Coloma Frozen Foods, but don't do it regularly as refrigerated shipping is expensive. Recently we've been getting our raspberries from Twin Springs Fruit Farm (which freezes their own). Using high-quality frozen fruit is something great lambic breweries do, and it allows to extend the fruiting season so you don't have to have enough tanks for all of your fruit beer at once!
That said, not all fruits are available locally. You can certainly source whole fruits from a good local produce supplier (and we have), but purees have their place too... especially in "smoothie" type sour beers. That said, there is no magic bullet on sourcing them. We've used Oregon Fruit, Greenwood Associates, Kerr/Ingredion, Asceptic Fruit Purees, Hop Havoc, Boiron, FruitGuild, and Araza. None of them are "always good" and none of them are always bad. It's often about preference. For example, Oregon Pineapple is thin, closer to juice, great for an IPA where you'll drop out the solids. Araza Pineapple is much thicker, perfect for a smoothie sour. Both taste great.
Frozen wine grapes are another great option, either juice or must. Again, I love working with local vineyards (Crow Vineyard and Winery has been especially nice to work with), but that isn't always an option! We've had good luck with Grapes for Wine and Wine Grapes Direct.
The only concentrates I've enjoyed are "freeze" concentrates (the wild blueberry and raspberry from Greenwood Associates are great). I've disliked the flavor of all of the standard high-concentration "boiled" concentrates which end up tasting like caramel, and are so thick that they are difficult to mix with beer. Granted, after an early batch with concentrates from Kerr we really haven't tried any more. On the other hand, Kerr's NFC (Not From Concentrate) raspberry juice was terrific, so I suspect the issue was the concentration.
Freeze-dried fruit can be a pretty good option for tropical fruits like mango. I've yet to find a mango puree that didn't taste cooked. The freeze-dried stuff tends to have a brighter "mango popsicle" flavor. It can be pricy, but there is a lot of flavor pound-for-pound. North Bay Trading generally seems to have the best bulk pricing.
Processing
We have a chest freezer at the brewery so we can keg fruit when it is ready, but not necessarily have to go onto it immediately. Freezing the fruit also helps break the cell walls allowing better/quicker contact and refermentation. Just make sure to line your freezer with cardboard so the bags don't stick to the interior. That's all we do for berries. Freeze them, let them thaw in the tank, then transfer beer on the next day.
When it comes to larger fruits (e.g., stone fruit like peaches and nectarines) we'll manually quarter them and discard the seeds/pits. In an ideal world we'd selectively process and freeze the fruit on a flow basis as it reached peak ripeness.
I've never had good luck with fermented citrus, so for limes, lemons, oranges, and grapefruit we use the zest. We use a Starfrit Electric Rotato Express. It struggles a bit on really large grapefruits, and we go through a couple a year as they just aren't sturdy enough for a "production" environment.
There is some science that cherry stems have glycosides that Brett can work on to free fruity aromatics... but in practice I find they add a "stemmy" flavor that reminds me of dried leaves. I like the pits though. Obviously nice to find a source that has your preferred processing so you don't have to do it!
However you process the fruit, purge the tank with CO2 thoroughly before transferring beer in. This will help ensure the brightest, freshest, fruit expression possible!
Reyeasting
We usually repitch rehydrated (with StartUp/GoFerm) wine yeast along with the fruit to ensure a rapid refermentation, scavenge oxygen, and enhance the fruit character. While our sour beer production area has "light" HVAC, we don't have jackets for our fruiting totes (Flextanks). As a result, we'll change our yeast depending on the seasonal temperature. Usually using more heat-tolerant red wine strains in the summer, and cool-loving whites in the winter.
We also add a small amount (5-7 PPM) of hop extract to prevent additional acidification if the beer is already sour enough for our tastes. See my article on hopping sours for more details.
Fruit Contact Time
I've slowly come to be an advocate for relatively short contact time, enough to ferment out the sugars, but not much more. This is especially true of raspberries (which develop a "seedy" flavor from extended contact). I've also heard strawberries as a quick-contact to reduce the phenolic "plastic" flavor they can develop. Although I've also read that can be varietal specific, and others claim freeze-drying can help mitigate.
If I'm aging a beer on raspberries and another fruit that I prefer longer contact, I'll do that separately in two totes. That way we can keg off the raspberry after 10-14 days, while the cherries, wine grapes etc. have a little more contact time (1-2 months). They we blend them together. This could also be accomplished sequentially by racking the beer off of the raspberries and then onto the cherries.
Separating Fruit and Beer
Our Flextanks have stainless steel filters from Utah Biodiesel Supply fitted over the racking arms with stoppers. A false bottom would likely work even better, but with a slow transfer we haven't had many issues with whole/pieces of fruit. The lone one I remember causing havoc with chunks of frozen mango that totally disintegrated.
Second Use Fruit
With all the time and effort of getting the fruit and processing it, we often try to get a second beer out of it. Second use fruit is more subtle, allowing a more "beer-forward" balance. You could likely get similar results from ~25% of the fruiting rate, but second use fruit is easier (and free)!
We'll often just push in a single keg of sour beer onto the fruit from a whole batch to "rinse" it. This gets a big fruit character and it's an easy way to make a unique one-off
We'll do a whole new batch onto especially high fruiting rate beers. For example when we did 4 lbs/gal of raspberries in Throwing Hearts with Other Half, we went onto the fruit with a sour red along with vanilla beans to make Galactic Swirl.
For Fruit of Many Uses, we racked the beer sequentially into each tote after a previous beer. Getting Chardonnay grapes (from Field Learning, our Bissell Brothers collab) before going into barrel, followed by raspberries, then cherries (both from Jammiest Bit), and white nectarines (Polite Company).
We haven't tried it, but I know some brewers who will knock-out fresh wort onto spent fruit as a way to get fruit flavor along with a strong house culture.
No matter your technique, be extra mindful of limiting oxygen exposure as you won't have refermentation to scavenge oxygen.
Jammiest Bit
Barrel #71 Golden Strong #3 (Pils, 2-row, Chit, Wheat malt, and Flaked Wheat to 1.056 with aged Celia and Lemondrop pellets). Primary fermentation with 58W3 and some microbes from a blend of older barrels that was primarily Yeast Bay Mélange (but also various dregs from Oxbow, Jester King, and Backacre). Then aged 17 months in a second-use Malbec barrel. The culture in the barrel itself was originally derived from a De Garde bottle.
Barrel #36 Marylambic #7 (Weyermann Barke Pilsner, Flaked Wheat, and Chit to 1.044 with .5 lbs/bbl aged East Kent Goldings). Primary fermentation T58. Then aged 13 months in a third-use Pinot Noir barrel. The microbes in the oak were originally from dregs from two Floodlands bottles.
Racked into two totes one with 150 lbs Twin Springs Raspberries and the other with 150 Baugher's Orchard Sour Cherries. Both frozen and thawed. Each received 10 g of HopSteiner Alpha Extract, and fresh 71B for refermentation.
Smell - Mix of fresh berries, raspberries more than cherries. Not a hugely complex funky or "Brett-forward" beer, but there is a little lemon and hay Barrel character is hidden behind the fruit as well.
Appearance - Crystal clear, brilliant red-purple. Light-pink head fizzles quickly, but stays as a thin covering.
Taste - Cherries come through more on the palate. Good fruit intensity, still really fresh/vibrant. Firm acidity, slight sharpness from the malic acid of the cherries? Again not an especially complex or funky beer, but it’s a showcase for good fruit. The Baugher's cherries without stems seems to have been a good choice. A bit sweet which lends a more Flemish Red lean rather than Lambic or Saison.
Mouthfeel - Medium-high carbonation. Medium-light body.
Drinkability - It grows on me as I drink it and my palate gets used to the acidity. Good blend of fruit, bright flavor, I just wish the base beer was a little more interesting.
Changes for Next Time - Wouldn’t mind depitted cherries to make sure we are getting good extraction.
Fruit of Many Uses
Base Beer: Belgian Pale #3
78% Murphy & Rude Virginia Pilsner
18% Murphy & Rude Wheat Malt
4% Murphy & Rude Vienna Malt
OG 1.047
.5 lbs/bbl 5-year-old Australian Summer Hop Pellets
Primary Yeast Lalvin 71-B
Microbes from Chardonnay Grape tote (originally a Bissell Brothers house souring culture they sent for the collab).
Then aged in a third-use Cabernet Sauvignon (microbes originally from Modern Times House of Sand) and Barrel #41 fourth-use merlot barrel for 11 months (microbes in barrel included East Coast Yeast Senne Valley, Bokkereyder dregs, Mad Fermentationist Saison, Casey, and Afterthought dregs)
Racked sequentially onto 150 lbs Twin Springs Raspberries, 150 Baugher's Orchard Sour Cherries, and 250 Twin Springs White Jade Nectarines.
Smell - The berry leads, more cherry than raspberry. Earthy hay, candied fruit salad. The nectarines and grapes don’t shine in the aroma, but they help to send it in a direction that isn’t one-note “berry.” Almost apricot brandy as it warms. I don’t taste anything off from the pits, seeds etc.
Appearance - Carbonation seems a little low. A hard pour results in only a two-finger white head. A few bubbles rising through the pale body. Good clarity.
Taste - Pleasantly tart lemony acidity, without being harsh. The nectarine comes through more distinctly on the palate. Finish is berry again, but light, bright, and juicy finish. Non bitterness.
Mouthfeel - Medium carbonation, could be spritzier. Smooth, no astringency. Light body, without being thin.
Drinkability - Really complex with the different fruit notes coming in and out of awareness.
Changes for Next Time - The Chardonnay is mostly lost, would be a better feature in a plain beer or maybe light dry hopping.
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.
In addition to music venues, bodacious barbecue, and epic tacos, this booming metropolis is The Lone Star State’s leading locale for incredible craft beer.
The post Three Beer-Filled Days in Austin, Texas appeared first on CraftBeer.com.
Quality matters at any size brewery, and the team behind beer quality is what matters most since data doesn’t analyze itself.
The post The People Behind Beer Quality appeared first on CraftBeer.com.
Cocktail-inspired beers allow brewers to get more creative while providing craft beer lovers with even more variety and diversity.
The post Flavor Forward: Cocktail-Inspired Beers appeared first on CraftBeer.com.
The connection between the craft beer world and ski culture is undeniable. A good beer is often a perfect way to cap a day on the slopes.
The post A Beer & Ski Lover’s Guide appeared first on CraftBeer.com.
American craft breweries are known for their ability to strengthen community connections. These three breweries are case in point.
The post Beyond the Beer: Three Breweries Serving Their Communities appeared first on CraftBeer.com.
Many chefs are finding the sweet spot for beer and smoked food, managing the level of smoke intake for a more pleasurable meal.
The post Smoke and a Beer appeared first on CraftBeer.com.
In a way, purchasing the Black Elks’ building was like coming home for Ken Carson. The building sits in a part of Albuquerque, N.M., he describes as “the ’hood.” Carson once lived here before moving to the more affluent Northeast Heights in the 1960s, where he attended high school with only three other Black students. […]
The post Soul Food and Cream Ale in Albuquerque appeared first on CraftBeer.com.
Apple Isles' Willie Smith's win Best in Show, Best Traditional Cider and Most Successful Larger Producer trophies.
The post Australian Cider Awards winners announced appeared first on Beer & Brewer.
As the craft industry’s demographics change, what can Beer City USA teach us about how history impacts beer today?
The post A Walk through History and Race in Beer City USA appeared first on CraftBeer.com.
Part of my routine is to scroll through Untappd to see if I can spot any common threads to the compliments or complaints... but I don't put a huge amount of stock in the average score (see this post). Blind rating by a skilled tasting panel is the gold standard... but having a large/diverse group of beer drinkers give you feedback has value as well! With four years of Untappd scores for our IPAs at my disposal, I thought it would be interesting to see which hops "the beer drinking public" preferred in Sapwood Cellars IPAs and DIPAs!
We started this series of IPAs when we opened to showcase our favorite hop varieties. We recently released #22 (Citra-Motueka). All of the batches were 6.5-7.5% ABV, with similar malt bills (American pale barley, chit, wheat, and oats), fermented with an English-leaning yeast, and dry-hopped post-crash at 3-4 lbs/bbl. The table below is the average Untappd score of all batches dry hopped with the variety listed.
The table below include all 65 "big batch" IPAs and DIPAs we've released that don't contain adjuncts (although I did include Phantasm beers). These are diverse in terms of recipe construction, alcohol strength, and dry hopping rate. As a result, the scores are a bit more prone to bias compared to the Cheater Hops data set.
For some batches you'd expect to see a high rating due to pairing two great hops together (e.g., Nelson/Galaxy or Mosaic/Citra). Both varieties score well across all our beers, so no surprise combing them results in a well-rated IPA. More interesting is sorting by the average standard deviation for the hops included. This shows which combinations rated higher than expected given the average scores for those hops across all beers. Snip Snap (Citra/Galaxy), Cheater Hops #22 (Citra/Motueka), Shard Blade (Mosaic/Galaxy), Cheater Hops #13 (Mosaic/Simcoe), and The Dragon (Nelson Sauvin/Mosaic/Hallertau Blanc) were all in the top-10 "overachievers." These hop blends follow different approaches either "leaning into" a particular flavor (fruity, or winey) or balancing fruity with a danker variety.
Rounding out the top-10 are two all-Simcoe (Cheater Hops #12 and Drenched in Green), two all-Mosaic (Fundle Bundle and TDH Trial #1), and an all-Nelson beer (3S4MP). Certainly a sign that these hops can shine alone compared to Citra and Motueka which are highly rated in blends, but haven't exceled in single-hop beers (despite our best efforts). Of course you need a great lot of hops for this to work; the bottom-10 also includes single-hop beers featuring: Simcoe (Cheater Hops #9), Nelson Sauvin (Cheater Hops #11), and Mosaic (Fumble Bumble)!
Two beers with Galaxy and Nelson (Cheater X and X2) each had a standard deviation close to 0. They still rate well, but no better or worse than expected across all beers with Nelson or Galaxy.
Surprisingly three of the bottom four included three varieties Cheater Hops #7 (Simcoe, Citra, Mosaic) Cheater Hops #6 (Motueka, Mosaic, Simcoe) False Peak (Idaho 7, Sultana, Citra). Blending hops can create a generic "hoppiness." These beers may have been missing a distinct "wow" aroma for people to grab onto.
The high/low scores for different batches brewed with the same single hop variety really drives home how unreliable this data likely is. Without multiple batches hopped with the same hop combination, it is impossible to say with certainty if a beer scored well because of aromatic synergy or a delicious lot of hops. Luckily several of the top-rated combinations are beers we have brewed multiple times.
The data does suggest to me that using one or two varieties for the dry hop is the best bet for making the most appealing IPA unless you have something very specific in mind. Often when breweries use a large number of hop varieties in a beer it is to promote consistency (batch-to-batch and year-to-year). It would be interesting to expand the data set to include beers from other breweries. That would produce data that is less specific to our particular brewing approach, hop sourcing, and customers' palates.
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.
Pitching YeastTo 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!
(Richmond, CA) – East Brother Beer Company is excited to announce the release of two flagship beers, Bo Pils and Gold IPA, in a towering new format: 19.2oz cans! The larger format cans, […]
The post East Brother Beer Puts Flagship Beers into 19.2 oz. Cans appeared first on The Full Pint - Craft Beer News.
If you believe in all things paranormal, visit one of these breweries for your next pint of beer.
The post Enjoy Both Sips & Spooks at these Haunted Breweries appeared first on CraftBeer.com.
Washington, D.C., while known for politics, has a strong craft beer scene, and in May 2022 the city gained its first beer trail.
The post Metropolitan Beer Trail Increases Business for All appeared first on CraftBeer.com.
History and beauty. The Brandywine Valley is steeped in both. With the crisp fall weather, there’s no better time to go on a brewery road trip.
The post The Hills of Beer Are Alive in the Brandywine Valley appeared first on CraftBeer.com.
Here’s a look at how six Northern California breweries are crafting conscious, sustainable beers, and why they do it.
The post The Localization of Beer Marches On appeared first on CraftBeer.com.
When Bhavik Modi walked into his first ever sales meeting for his new craft beer line, he wasn’t alone. Tiffany Wooten, a veteran sales representative from brewery incubator Pilot Project Brewing, was by his side, convincing the team at high-end contemporary Indian restaurant ROOH Chicago to serve Azadi Brewing’s cardamom golden ale and Kesar mango […]
The post Pilot Project: Launching Brands and Lowering Barriers in Craft Beer appeared first on CraftBeer.com.