Royal wedding chocolate biscuit cake

• 1/2 teaspoon butter, for greasing pan
• 8 ounces/227g  McVities rich tea biscuits (apparently similar to Marie Biscuits)
• 1/2 stick (4 tablespoons) unsalted butter, softened
• 1/2 cup granulated sugar
• 4 ounces/113g dark chocolate
• 1 egg, beaten
• 8/227g ounces dark chocolate, for icing
• 1 ounce / 28g white chocolate, for decoration

PREPARATION

1. Lightly grease a small (such as 6 x 2 1/2-inch) cake ring with 1/2 teaspoon butter, and place on a parchment-lined tray. Break each of the biscuits into almond-sized pieces by hand 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 of the gaps on the bottom of the 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 tope 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.

source:  Epicurious

Source: stylefrizz

The official Royal wedding Cake of Will and Kate