Prince William’s favorite chocolate cake is a no-bake cake made with English “biscuits,” (or what we, in the U.S. call cookies). Princess Diana’s former Chef Darren made this for his royal groom’s cake.
CHOCOLATE BISCUIT CAKE
1/2 teaspoon butter, for greasing pan
8 ounces McVitie’s rich tea biscuits
1/2 stick (4 tablespoons) unsalted butter, softened
1/2 cup granulated sugar
4 ounces dark chocolate
1 egg, beaten
8 ounces dark chocolate, for icing
1 ounce white chocolate, for decoration
1. Lightly grease a small (6-inch by 2 1/2-inch) cake ring with 1/2 teaspoon butter, and place on a parchment-lined tray. Break each of the biscuits by hand into almond-sized pieces and set aside. Cream the butter and sugar in a bowl until the mixture is a light lemon color.
2. Melt the 4 ounces of dark chocolate in a double boiler. Add the butter and sugar mixture to the chocolate, stirring constantly. Add the egg and continue stirring. Fold in the biscuit pieces until they are all coated with the chocolate mixture.
3. Spoon the chocolate biscuit mixture into the prepared cake ring. Try to fill all the gaps at the bottom of this ring, because this will be the top when it is unmolded. Chill the cake in the refrigerator for at least three hours.
4. Remove the cake from the refrigerator, and let it stand while you melt the 8 ounces of dark chocolate for icing. Slide the ring off the cake and turn the cake upside down onto a cooling rack. Pour 8 ounces of melted dark chocolate over the cake, and smooth the top and sides using a butter knife or offset spatula. Allow the chocolate icing to set at room temperature. Carefully run a knife around the bottom of the cake where it has stuck to the cooling rack, and transfer the cake to a cake dish. Melt the white chocolate and drizzle on top of the cake in a decorative pattern.