I don't recall exactly when I was introduced to cask beer, or real ale as it's termed by
CAMRA, but I've long enjoyed this departure from the normal draught experience. There are certainly those who don't care for this "warm, flat" beer; for me, the cellar-level serving temperature allows more aromatics and flavours to emerge, and the reduced carbonation lends a fuller, richer mouthfeel to lower-gravity ales.
My home serving setup has not progressed to kegging yet, let alone setting up a firkin with a handpump (though there are some interesting
DIY ideas for doing this). A while back, though, Northern Brewer started carrying an innovative solution for those who wanted to have real ale at home.
Cubitainers are expandable, reusable plastic containers that are available in a number of sizes and can take a tap attachment. They can't take a very high level of pressure, which makes them perfect for serving cask-style beer via simple gravity feed. I picked up a few of the one-gallon size a year or two ago, but had only tried using them once before. When my recent
English summer ale was ready for bottling, it seemed like a perfect time to put one back in action.
Since the volume going into bottles was going to have a higher level of carbonation, I filled the cubitainer before adding my priming solution to the bottling bucket; the cask portion received a separate preparation of priming sugar to lend it a more appropriate amount of pressure (and to prevent the thin plastic container from, y'know, exploding). This was kind of a test run for the cubitainer cask method, so no finings were added to the "cask".
After a week in my warm brew closet, during which time the cubitainer expanded and the yeast flocculated solidly, I let it chill in the fridge for a while and we had a small cask release party. Real ale traditionally sits well for just a couple days once tapped, after which it begins to turn, so the thing to do seemed to have most of it in one go. The results: mixed.
It was difficult to reach a real "cellar" temperature; with spring in full effect, even our basement was relatively warm, but in the fridge for even an hour or so seemed to bring it down a bit too far. While not bad, it was just...off...a little. The bigger effect was in the mouthfeel. While the cubitainer had built up significant internal pressure, the beer in the glass was pretty much wine flat. Again, while not the worst thing in the world, it still wasn't quite right. Beyond that, the summer ale itself was pretty green; the mineral quality of the yeast (Wyeast 1028) was very assertive, giving the beer a lager-like quality. This is still present in the mature bottles, though it's mellowed.
While this wasn't quite a rousing success, it was still encouraging; I
will do this again. Some considerations for next time:
- More priming sugar. I'm fairly certain that BeerSmith, which I use to estimate carbonation as well as build recipes, accounts for some CO2 left in solution after fermentation; however, in rousing the yeast to ensure fermentation was complete, much of that was probably driven out. Going a little heavier on the priming solution (within reason) should cover the issue.
- More carb time. Giving the cask more time to allow the generated CO2 to get back in solution should also improve the carbonation levels.
- Improved "cellar temperature" method. Instead of moving in and out of the fridge, a small insulated box with room for the cask and one (or maybe two) ice pack(s) might keep the beer at a better "cellar" temp.
- More appropriate beer style. Admittedly, the beer in question was probably not the best one for casking: it was a light wheat beer, and the higher carbonation of the bottles seems to suit it much better than the low-carb cask did. In addition, the young yeast character was a bit overwhelming. An all-barley bitter or porter, possibly with a fruitier yeast, will probably turn out quite nice served this way.
- Cask hopping. A few whole hops, maybe in a hop bag, would really make this something special.
Half the fun of these projects for me is trying out homespun methods to imitate or commercial process or product, or even to come up with something even more interesting. Keep innovating, and find your bliss.
- Br. Absalom