1. Melt the butter, remove from the heat and mix in the cocoa powder. 2. Whisk the eggs until frothy, add the sugar and whisk thoroughly again. Then mix in the cocoa mixture. 3. Add the flour and, along with the chopped chocolate, mix into the batter. 4. Pour the batter into a greased enameled GN. Bake in a preheated combi oven on the specified program, the cake must be moist, not dried out, and dense.