Add cooking oil about1/2cm deep to the wok (the more the better). Heat it to 70% to 80% heat (the oil temperature is about 220 degrees, and the middle of the oil turns upward), add the frozen French fries and fry for about two minutes until the French fries swell and become Huang Shi. Remove with a colander, drain the remaining oil, and add appropriate amount of salt according to personal taste. Add tomato sauce and serve.