Sourdough Guinness DoughA rough blend of flour and beer kick off a bread making effort.Guinness Sourdough IngredientsIngredients for a loaf of beer-based sourdough.Honey Brown Lager BreadA loaf of sourdough cools on the countertop.Proof of BreadA well-proofed loaf in a baneton.Sour HeelThe heel of a loaf of sourdough bread rests on a cast iron pan.