Recipe from chapter 11. Ingredients Serves 8 For the cake: 125g/5 oz cocoa powder, plus more for dusting 10 oz. plain bitter chocolate, broken into pieces 250g/10 oz unsalted butter, cut into cubes 200g/8 oz plain all-purpose flour 1.5 tsp. baking powder 3/4 tsp. salt 500g/ 20 oz granulated sugar 6 eggs 2.5 tsp. vanilla extract For the buttercream topping: 300g/12oz plain chocolate 150g/6oz butter 500g/1b icing sugar 3 tbsps. cream Method 1. Have all the ingredients at room temperature. 2. Preheat an oven to 180°C/350°F/Gas mark 4. 3. Using a small pastry brush, grease 2x20cm/8 inch sandwich cake pans with oil or softened butter, making sure to coat the details and crevices in the pans. Dust thoroughly with cocoa powder; tap out excess. 4. To make the cakes, put t

