While doing some research on korean fried chicken, found my way to Beyond Kimchee. I thought I was there to check out her fried chicken recipe but how could I help myself from not stopping to read about sweet potato doughnuts. Here's a link to the recipe: http://www.beyondkimchee.com/sweet-potato-rice-donuts/
The recipe is pretty easy, especially if you already have the potatoes ready. And the frying up is pretty easy as you don't have to cook it as hot as regular deep fried item. See the Beyond Kimchee's comments about oil temp. Got some pictures of my recipe test [yes, I remembered this time].
Pre-doughnuts
I love the color from the potatoes.