split cake layers. Sprinkle layers with coconut milk if desired.
Mix sugar, sour cream and coconut. Save 1/2 cup for topping. Chill. Keep 1 cup of this mixture for frosting. Spread remaining portion between layers. Mix cool whip with reserved 1 cup of frosting mixture. Pile frosting on top and sides of cake and sprinkle with reserved 1/2 cup coconut. Cover with cake saver and refrigerate 3 days. Makes 12 or more servings.