This classic southern cake can be over-the-top sweet. Enter coconut sugar, a sweetener from the sap of the coconut tree's flower buds. While it has no coconut flavor, it does bring a caramelized, almost savory complexity to baked goods. It's perfect in a cake that's plenty sweet (as well as moist), thanks to the fresh banana and pineapple. This recipe appears in our cookbook, "A New Way to Bake" (Clarkson Potter).