Buttermilk Chocolate Cake with Brown Sugar and Fine Sea Salt

In my first book I gave the recipe for Nathalie’s chocolate cake, a dessert so good and so easy to make it has travelled around the world. This is its successor! It is true that this recipe is a tiny bit more technical, but we’re all accomplished bakers afraid of nothing these days, aren’t we? This cake has a dense and velvety texture without containing too much fat, because it doesn’t have any cocoa butter, just cocoa powder. The buttermilk gives it a wonderful lightness and the combinatio