Cask ale is a British tradition that has taken a hold in the United States. Beer is placed into a cask or firkin. Here at North by Northwest our brewers add a little freshly fermenting wort to prime it (aka Kräusening it). We found it's a much better way to condition than sugar addition. We also dry-hop by adding whole leaf or whole cone hops at the same time.
Cask ales must be treated with considerable care. They have to be kept cool, handled gingerly, and when it’s time to tap the kegs, they require an experienced, or at least educated, hand.