In a large bowl, mix 3 large sweet potatoes cut into wedges, ¼ cup of vegetable oil, 2 tbsp sugar, 1 tbsp salt, 2 tbsp cajun seasoning (or whatever you like). Spread evenly in one layer on a baking sheet, bake at 350 (400 for crispier fries) for 15. Then turn potatoes and bake another 15 minutes.