Add a touch of color and sweetness to your fries by opting for the orange tuber over its yellow and white cousins. It's best to keep the skin, which contains vital nutrients and adds a satisfying crunch. Slice your sweet potatoes into even-sized matchsticks, dry them in a clean dish towel and fry them as soon as the oil is hot enough. For a healthier option, bake them in the oven with olive oil, coarse salt and the spices of your choice.