Despite the fact that they've only been around for a few years, Side Project Brewing has quickly become the makers of some of the most sought after bottles in the craft beer universe. Side Project Derivation Imperial Stout — the breweries series of barrel-aged imperial stouts — are a great example, each taking a big, bold imperial stout and aging them in bourbon or rye whiskey barrels. Each clocks in at 14% or more, and has their own signature quality to help them stand out. Six blends have been released already, and each recipe, barrel and time spent aging, and special additions vary. Each batch of Derivation is a well thought out, decadent treat that's perfect for sharing at your next special occasion.