Plums for a Cake

This is not the first time I've made the delicious Plum and Almond Chocolate Cake from La Tartine Gourmande. First you caramelize some plum slices with a little brown sugar and cinnamon, then mix up a simple cake batter with melted butter and chocolate, and ground almonds and buckwheat (I think it calls for spelt, actually). The plums get poured over the batter and all gets baked, to pleasing effect.