Lúcuma: Tastes like caramel and chocolate together, but it comes from a fruit. Apparently it's quite healthy. Great flavor for ice cream, liqueurs, cakes, and candies. I discovered this flavor in Chile.
Ube/taro: This purple yam tastes like purple. The color is the best. I guess it tastes nutty/starchy/sweet. Can be used in savory dumplings, but it truly shines in ice cream, cakes, candies, and the like. I discovered this flavor from my Filipino roots.