Proprietor's vintage. Imperial stout aged in bourbon barrels 13.5% ABV. Our brewery began in 1996 when we delved into the rare art of fermenting beer in oak barrels. Ten years later, we took our barrel machinations to the next level by aging beer in vessels inherited from bourbon houses and other spirits producers. Ever since, the resulting beers have flown under the banner of the Proprietor's Vintage Series, which has become one of the most extensive barrel-aging programs in the craft industry of all the beers in our Proprietor's Vintage Series, Parabola is the most notorious. It is always a beast of a beer, with intense flavors of black cherry, dark chocolate, vanilla and roast coffee yet each annual release also bears its own subtle imprint. For this latest edition, we aged the beer for a year in an equal combination of eight-year-old Blanton's bourbon and 12-year-old Weller wheated whiskey barrels. The wheated whiskey barrels accentuated Parabola's signature richness with fine notes of cereal grain, while the bourbon barrels imparted their classic notes of toasted coconut and cocoa nibs. Adam Firestone. David Walker. Matt Brynilson.