Here in Hawaii we have a sweet potato that is purple called Ube. It is very popular with the local population. Quite a few of the restaurants use it to make sweet/savory mashed potatoes.
I was heading to the Ube festival and they asked all food vendors to come up with a recipe using the purple sweet potato. Naturally, I wanted to pair it with passion fruit (lilikoi).
These tasty morsels went over wonderfully! I was completely out of cookies within 2 hours. All the flavors of a sweet potato pie packed into this delicious cookie with the added benefit of lilikoi on top.
Look for the Ube Sweet Potato at you local specialty markets.