VERY MOIST!!! Calling all coconut cake lovers! This one is for you! The secret to this cake is the use of frozen coconut (because of its wetness), the blend of sour cream and the required refrigeration time. Also, the use of the 'real butter' yellow cake mix, not a white cake mix. A true winner for flavor and moistness. My granddaughter requested a coconut cake for her birthday. I remembered that this was the popular recipe my mother used in the 1960s for her coconut cake. To get the best flavor it is required to let the cake "mellow" in the refrigerator at least a day before cutting and the longer, the better it gets. Therefore, patience is required. It has been known to be called "The 3 Day Coconut Cake". May be kept refrigerated up to one week. I normally use 2 square 8x8 cake pans for prettier slices and trim the brown off of the outer cake edges after cooling. Makes a great presentation for a birthday cake celebration. Time stated for recipe does not include refrigeration time.