Sweet potatoes fries are a staple around here. I don't actually "fry" them though. I do them in the oven, so much healthier than frying. I cut the sweet potato in strips. Put a tablespoon (or so) of olive oil in a bowl. Add a dash of cayenne and toss the fries in the oil mixture. Bake in a 450 deg oven for 20 minutes and they're done.