French fries, 250g potatoes, custard powder, eggs, salt, sugar, starch, tomato sauce. Peel potatoes, wash and cut into strips, put them in a bowl, add salt, egg yolk and custard powder and mix well for later use. Heat the oil in the pot to 50% heat, add the French fries, fry them slowly over low heat until golden brown, take them out and put them on a plate. Leave a little oil in the pot, add tomato sauce and sugar, stir-fry a few times, thicken with water starch, and serve.