out clean. Let cool completely in pan on a wire rack. Frosting: Combine chocolate and butter in top of a double boiler. Bring water to a boil, reduce heat to low and cook and stir until chocolate and butter has melted. Remove from heat. Let cool. Add confectioner's sugar and half of the milk, beating at medium speed. Add the vanilla and additional milk as needed to bring to spreading consistency. Spread on cooled cake.