This recipe is inspired by Mexican chocolate flan, a cake topped with flan. Despite their very different textures, the two preparations are baked in the oven at the same time. In this version, the cake is flavoured with Christmas spices, such as cinnamon, nutmeg and ginger. Incorporate egg whites beaten until stiff to make the cake ultra moist. The flan evokes crème caramel with its slightly jiggly texture. A wonderfully chic retro-looking dessert.