To make Maple Bourbon Barrel Double Negative, we added ultra dark maple syrup to the base recipe of our reigning GABF champion imperial stout. Then we aged it in Heaven Hill bourbon barrels. The result is a decadently roasty, balanced stout with a tasteful dollop of rich maple (not too sweet!) and pronounced whiskey barrel notes of toffee, vanilla, and booze. Best served at cellar temperature or even up to room temperature.