INGREDIENTS FOR CAKE: 1 box Chocolate cake mix, 3 eggs, 1/3 cup vegetable oil, 1 cup water; Mix and bake according to the instructions on the box; cool completely before frosting.
INGREDIENTS FOR FROSTING: 1/2 cup (1 stick) butter, softened, 1-1/2 cups powder sugar, 3 squares (3 oz.) chocolate, melted, 1/2 cup ground coconut flakes, 1 teaspoon vanilla extract, 1 teaspoon rum extract; Beat butter and powder sugar until light and fluffy. Add melted chocolate, vanilla and rum; continue beating until shiny and smooth. Stir in coconut. Frost the cake; garnish with chocolate shavings or coconut flakes.