I've been once now, and their dessert menu contained something with a name like "Chocolate Espresso-Rum Cake". I don't think it was flourless, but it almost had a texture as if it was. I tend to forget that I don't consume a lot of caffeine on most days. I consumed a lot more than usual yesterday, at least if you count the piece of cake :-) Lots of espresso in it, lots of cocoa, and in general a really intense flavor.
I dub it the "Rum and Caffeine Slap-You-Around Cake". It wins.