The obvious (probably too obvious, these days) answer was flourless chocolate cake. However, while looking through my very extensive recipe file for the perfect example, I came upon a recipe for a flourless orange ginger cake (gateau à l'orange et au gingembre) from Clotilde Dussoulier's wonderful blog, Chocolate and Zucchini. I made two, and they were a huge hit: moist and flavorful, with more than a hint of bitterness from the orange peel (you boil oranges for two hours, then puree them to form the foundation of the cake). I have made it again more recently to equal raves: everyone who tries this cake wants the recipe. So here's the link to it.
|Clotilde's Flourless Orange Ginger Cake|