This recipe is best described as a chocolate pound cake—it’s just as rich as it is delicate. The flaky salt sea brings out the flavor of the chocolate in a way that reminds me of salted caramel, my favorite combination of salty and sweet. Though you can make this dessert using a round cake pan, I prefer to use a loaf pan as an allusion to the pound cake. Feel free to make it up to a day in advance and reheat it just before serving.