1 white sheet cake
2 lg. pkgs. fresh frozen coconut
2 c. sugar
2 sm. sour cream

Mix last 3 ingredients and set overnight in refrigerator. Trim layers and split layers with string. Layer cake, coconut mixture, cake, ending with coconut mixture on top. Place in freezer 1/2 day or more before serving. Keeps well in airtight container in freezer.