When we make this beer, there is a stir around the brewery for several months, and plenty of sleep is lost. It all starts innocent enough with a terrific Robust Porter recipe using a normal ale yeast fermentation – then we introduce a bacteria that infects the beer with wild yeast cultures to further ferment and sour the beer. I know what you're thinking, but it already tastes better than you'd expect – but then we make it even better by blending in just a slight amount of Michigan tart cherries to take the edge off the sour character..