For a Coconut-Lemon version substitute lemons for the limes.
Variation Toasted Coconut-Lime Cake
Adding toasted coconut to the cake will add crunch and intensify the coconut flavor. To toast coconut in the oven, spread coconut in single layer in shallow baking pan. Bake at 350°F for 7 to 10 min. or until golden brown, stirring occasionally.
Both the cake and the frosting can be prepared a day ahead and assembled the day after. Keep frosting refrigerated and keep cake covered until ready to use.