Looking for a unique/healthy layer cake
Id like to make a festive cake for my parents anniversary next week- they're health conscious and are trying to limit refined sugars and carbs, but they still like cake! Ive been searching for something interesting, perhaps using vegetables (beets, sweet potatos, avocados, etc) or some out of the ordinary flavor profiles. Preferably something layerd!:) I know its a tall order to fill, but if anyone has any ideas let me know- Thank you!