Coffee brings out the taste of chocolate, and brewed coffee is the secret ingredient in this cake. If you prefer, you can substitute 1 cup of water or, better yet, sparkling water.
Garbanzo bean flour adds fiber to a gluten-free diet; one serving of the cake is a good source of fiber.
Vinegar in a cake? In gluten free baking, we need all the help we can get to end up with the highest-rising cake. The vinegar gives the baking powder a little “kick” and balances the flavors. Don’t worry, you won’t taste it!