Let’s go to Nantes, in France, where sugar and rum from the West Indies once arrived at the docks. Here is a cake that is as simple as it is delicious. With no baking powder, the almond flour and the butter make it soft and melt-in-the-mouth. For the flour, T45 gives a fine, delicate crumb, while T65 gives a bit more character and structure. Whichever you choose, sift it well: this is the key to a light cake.