My Local Home Brew Shop (Weak Knee) recently acquired another whiskey barrel for a group fill. I have enjoyed the process of the first one enough to jump on board with this one. For this round we will be making a stronger beer to stand up to the stronger whiskey and oak flavors of the first use barrel: a Chocolate Imperial Coffee Stout
This will be the first beer I have brewed with either chocolate or coffee. Cocoa powder will be added at the end of the boil and then at the start of secondary in the barrel. We will then age the beer in the barrel for 6 to 8 months before steeping the coffee.
It's a complicated recipe, with a lot of specialty malts, and then with the chocolate, oak, whiskey, and coffee added to the mix. I think the flavors are of the sort that obviously work well together so I'm pretty confident that we'll end up with a pretty good final product. The main concern I have is that if the FG ends up too low for enough of our batches that the oak, chocolate, whiskey, and roasted malt could take on too sharp an edge. My piece of the batch is less than 1/10th of the beer that will be in the barrel so there's nothing I can do to prevent this - hopefully everyone will hit the target FG of 1.019.
We are scheduled to put this beer into the barrel on 4/18 so I'll have just under 3 week to get it fermented out. I don't expect any issues with this. I'm really excited to get to do another one of these.
As a last minute decision, based on the huge grain bill and a fairly low projected efficiency, I decided to try my hand at a Parti-Gyle beer which is a second, weaker, beer using the sugars remaining the mash after the first big beer is mashed out. This will be a
Dark Chocolate Sour.
Recipe Details:
- Grain:
- 9 lbs 2 Row
- 2 lbs Roasted Barley
- 2 lbs Chocolate malt
- 1 lb 8 oz Munich
- 1 lb Crystal 40L
- 12 oz Aromatic
- 12 oz Carapils
- 4 oz Black Patent
- Hops:
- 1 oz Cascade (Pellet, 7.2% AA) at 60 min
- 1 oz Fuggle (Pellet, 4.2% AA) at 30 min
- 1 oz Fuggle (Pellet, 4.2% AA) at 15 min
- Yeast:
- Wyeast 1098 British Ale yeast
- Red Star Premier Cuvee (For Priming)
- Water:
- 10 gal spring water
- 1 tsp Calcium Chloride
- 1 tsp Gypsum
- 1 tsp Irish Moss at 15 min
- Extras:
1st use Bourbon Barrel 3 oz of Jack Daniels Soaked Oak Cubes
- 5 Tbsp Hershey's Special Dark Chocolate Powder at 5 min
- 5 Tbsp Hershey's Special Dark Chocolate Powder in secondary
- 750 mL of Jim Beam Extra Aged Bourbon Whiskey
Process Details:
- Batch Size:
- Mash:
- 155 F for 70 min (Target 153 F for 60 min)
- Boil:
- Fermentation Temperature:
- Ambient Basement Temps (60 to 63 F)
- Primary Duration:
- Secondary Duration:
Barrel Aging Duration Secondary on Oak:
Coffee Steeping Duration:
- NA - Decided not to use coffee on this batch
Results:
- OG:
- Efficiency:
- FG:
- Apparent Attenuation:
- ABV:
Brewing Notes:
- 3/28/15 - Made a 1 liter yeast starter with 5.5 oz of LME. Added 1/8th tsp of yeast nutrient. Left on the stir plate to propagate over then next 24 hrs
- 3/29/15 - Brew day - 8:00 AM to 12:30 PM including setup (started the Parti-Gyle after this):
- Heated 8 gal of strike water to 185 F (assuming 20 degree loss to the mash tun, a 1.5 ratio of water to grain, and that the grain was at 60 F) - took 40 min
- Added Gypsum and CaCl to the kettle as it was heating up
- Transferred 28 qt of strike water to the mash tun and let the temp settle for 10 min - temp settled out to 178 F
- Added the grain and stirred in (there is a ton of dark malt in this one - the liquid was inky black)

- Measured the temp after 10 min as 160 F. I stirred to cool until it got down to 156 F. Restarted the clock on the mash at this point.
- Gave the mash a stir at 30 min - temp was down to 155 F
- Brought 6 gal up to 185 F for the Batch Sparge (and Parti-Gyle Beer) - took 25 min
- After 60 min the mash was at 154 F
- Stirred, vorlaufed, and drained (slowly at first and then at full speed)
- Added 3 gal batch sparge, stirred, vorlaufed, and drained. Flow was being inhibited by the mash for some reason. I have to stir and then blow air into the manifold to get a decent flow
- Collected 7.25 gal of pre-boil volume (right on target)
- Brought to a boil - took 15 min
- Added the 60 min hops once the hot break had settled down
- At 6.25 gal the 30 min hops were added
- At 5.75 gal the 15 min hops and irish moss were added
- Added the chocolate with about 5 min left in the boil - I stirred well to help the chocolate dissolve

- Added the wort chiller at flameout to sanitize
- Chilled down to 65 F - took 10 min
- Drained into the fermentor - aerating by letting the wort fall into the bucket
- Collected just about 5 gal (slightly less)
- Pitched the entire starter into the beer - it looked like it was pretty much at the height of it's fermentation activity which should get me a quick start
- Gravity was measured as 1.082 at 65 F which is about 1.083. The sample had a nice balance between roast and chocolate. The chocolate seemed to be at a nice level (not too strong which I was thinking might be an issue with 5 heaping tablespoons)
- Setup the fermentor with an airlock as I have quite a bit of headspace
- 3/30/15 - The airlock was bubbling this evening
- 4/9/15 - After a little less than 2 weeks in the fermentor the beer is down to 1.038. I expected it to be quite a bit lower than that but I guess the large percentage of specialty malt and higher than target mash temp played a factor. The beer is still bubbling a bit so maybe it will come down a few more points. It has a nice chocolate flavor along with a firm roast. The sweetness of the beer doesn't seem out of place - the alcohol level is a bit off the "Imperial" mark though. This beer will really just be one in a larger blend so it's probably not that big a deal.
- 4/18/15 - Measured the gravity again today - still 1.038. I guess it's done. Very surprised at this (only 52% attenuation). Drove it to homebrew store for transfer into the barrel which will happen next week.

- Two batches in a weekend (even a long weekend) is too much brewing for me. Two and a half batches like I did today is way too much. I'm exhausted.
- Brewing with chocolate is fun but the powder is pretty darn messy. Cleaning the kettle was a pain. I imagine cleaning the fermentor out is also going to be a pain.
- FG is a product of mash temp, yeast, and grain bill. In order to predict FG you need to understand the impact of all three of those variables (and there may be others as well). I'm not sure there's anything to be done to get an accurate prediction of a recipe the first time you brew it. This recipe has an unusually high percentage of specialty malt (48%) which made the prediction even more difficult. Never would have guessed I'd only get 52% attenuation even with this grain bill.
- I oaked this batch for 2 years. The oak character is kind of sharp and "wine-like. I think I would have been better off charring the oak prior to adding it for aging. This could produced some more Whiskey like flavors. I think I'll do that next time I try an oak aged dark beer.