I second the chocolate stout cake that tania9 linked. I posted it here on CC a while back just so all of my recipes could be in one place! The Guinness just gives it that extra kick that makes it taste to rich and dark chocolatey (similar to what coffee does). And it is so dense and fudgey, it almost seems like a cross between cake and brownie in texture.
When I made 3/4 of the recipe (the product of 1 bottle of Guinness), it made a full and perfect 8" square cake.
When I made 3/4 of the recipe (the product of 1 bottle of Guinness), it made a full and perfect 8" square cake.








