In the U.S. desserts usually fall under the categories of cake, pie or ice cream. I'm sure there are desserts that don't belong in these categories but they're the exception, not the rule. This dessert is a breath of fresh air and not (that) bad for you either. At least it has something in it besides sugar that your body can use including Vitamin A. It may seem strange to use a vegetable for dessert but we do it all the time when we make Pumpkin Pie (or Sweet Potato pie in the south). And what better than to use a tuber that purees nicely and is already reasonably sweet.
Boniatillo is a Latin American dessert described as a Cuban tropical sweet potato pudding. The Cuban version uses the white fleshed Boniato sweet potato. This rendition uses the more commonly available Jewel or Beauregard Sweet Potato most often mislabeled as Yam in American grocery stores. It also infuses the sugar syrup with lemon, orange and cinnamon creating a nice fruity sweet sensation along with pleasant Sweet Potato overtones. To add richness butter and egg yolks are beaten into it then whipped egg whites are fluffed and folded with the pudding to give it body. A sprinkle of cinnamon and a little cream and you have a nice tropical dessert pudding.