Here's how to make "Shio Kenpi," a type of sweet potato snack fried in cold oil. Cut the sweet potato into thin strips, remove the bitterness, and pat it dry thoroughly before frying it slowly in low-temperature oil. The key is to fry it until it makes a pleasant sound when tapped with chopsticks. Simply sprinkle salt on the hot, freshly fried snack, and you'll have a crispy snack with the natural sweetness of sweet potato that you'll crave from time to time.