Banana Rum Coconut Layer Cake

Bananas make great cakes (and muffins, quick breads, tarts, and pie fillings). One thing about bananas, though, is they have to be ripe. Never use a banana for baking if it is not at least dotted with brown spots—or even darker—or your cake won’t have any banana flavor. And always mash bananas with a fork or potato masher—don’t throw them in the food processor—hand-mashed bananas impart a more vivid flavor to any batter or filling. I like whipped cream with this cake, but chocolate is also