1 Preheat oven to 180c/350f/Gas 4. Grease a 20.5cm/8" cake tin. Beat the butter, sugar, eggs, flour, hazelnuts (if using) and cocoa in a bowl by hand or with an electric hand whisk (or put into a food processor) until smooth. 2 Spoon half the mixture in to the prepared cake tin. Sprinkle over half the chopped dark chocolate, white chocolate and frozen berries. Spoon the rest of the mixture on top. 3 Scatter the remaining chocolate pieces and frozen berries over the top, (push the berries down into mixture, so they are almost covered) and bake for 40-45 minutes. The cake should be just coming away from the edges of the tin slightly and squidgy in the middle. 4 Leave in the tin for a couple of minutes before turning out. Serve warm slices with creme fraiche or serve cold for afternoon tea. Recipe by: Food & Drink