Black Cake - Caribbean Fruit Cake - is an intense rum cake which is the standard holiday dessert on all Caribbean islands.
Store leftover cake, tightly wrapped in parchment paper (or waxed paper) or plastic wrap and then aluminum foil.
Black Cake is not usually decorated much, if at all, unless it is for weddings. For Christmas, the most garnish you will ever find is some powdered sugar and a few glace cherries.