Not all flourless chocolate cake is gluten-free, however: sometimes you'll wind up with a graham cracker crust or something else. You might be better off heading to a bakery that specializes in gluten-free: for instance,
Rose's in EvanstonFrankly, flourless chocolate cake is dead-easy to make, yourself: it's basically dense chocolate custard. Here's a recipe from
Epicurious. If you do a search there, they have a dozen or more recipes that all look delicious, but that's the most basic one I found (I think there are even more basic ones that eliminate the sugar and cocoa powder if you google - the basic premise being you melt chocolate and butter together, whisk in eggs, pour the mixture into a baking receptacle, and bake it until it sets. One tip - better chocolate = better cake.)