Three-Day Coconut Cake
["1 box white cake mix", "1 3/4 c. sugar", "16 oz. sour cream", "12 oz. flaked coconut", "8 oz. carton whipped topping, defrosted"]
["Prepare cake mix according to package directions, making 2 layers.", "When layers are cool, split in half.", "While cake is cooling, combine sugar, sour cream and coconut; chill.", "Reserve 1 cup of sour cream mixture.", "Spread remainder between the layers. Blend whipped topping and reserved sour cream mixture.", "Spread on top and sides of cake.", "Seal cake in airtight container and refrigerate for 3 days before eating."]
["white cake mix", "sugar", "sour cream", "flaked coconut", "carton whipped topping"]