Peel the sweet potato and cut it into thin slices. After the water is boiled, steam it on the pot 15 minutes. After the sweet potato is steamed, add sugar and press it into mud, then beat in an egg and mix well. Add a spoonful of cooking oil and black sesame seeds and knead into dough. Knead it into a circle and flatten it, roll it into a cake crust and cut it into various shapes. When the oil temperature in the pot is 50% hot, fry it slowly with low fire, turn it over frequently and fry it evenly until both sides are golden.