Aug 12, 2015 Spent Grain 101 Our customers often ask how exactly this whole spent grain thing works. As some of you know, Barley Labs started because of my pappy's homebrewing hobby. Well, he figured it'd be easier to show you rather than tell you exactly how barley becomes spent grain by capturing video during his last homebrewing session. And there you have it! As you saw, the grain has just been steeping in hot water, which means no drunk doggies (even though my humans say my brother and I act like we're drunk when we're begging for treats). Woofs & Love, pals!