Wash the sweet potatoes thoroughly and peel them.
Slice the sweet potatoes thinly.
Soak the sliced sweet potatoes in cold water to remove starch.
Drain the sweet potatoes in a strainer to remove moisture.
Generously add cooking oil to a pan.
Fry the sweet potato slices over medium heat until golden and crisp.
Drain the oil and finish by sprinkling salt or sugar.