Preparation1. Put the chocolate into a solid container. Cover with foil and steam for 1 minute at 100°C. 2. Meanwhile, cream the butter and vanilla sugar till pale and creamy. Add the egg yolks and beat again. Fold in the walnuts, flour, breadcrumbs and melted chocolate. 3. Beat the egg whites into stiff peaks, and fold into the mixture. 4. Grease 6 ramekin dishes and dust with a layer of icing sugar. Divide the mixture equally between the dishes, cover with a piece of pleated foil and place into the steam oven. Steam for 20–25 minutes at 100°C. 5. For the decoration, melt 150 g (5 oz) dark chocolate with 50 g (2 oz) white chocolate. Place the chocolate in a solid container, cover and steam for 1 minute at 100°C. Pour a little onto each serving plate, and place the puddings on top. Decorate with seasonal fresh berries.