2. Add egg white, soy sauce and cornmeal to beef slices and marinate for 10 minute.
3. Cut the onion for later use.
4, from the oil pan, put 2 tablespoons of oil, stir-fry the mung bean sprouts, add the river powder, and quickly stir-fry the soy sauce and put it on the plate for later use.
5. Take the oil pan and refuel. After the oil is boiled, pour in the marinated beef and stir fry quickly. After thickening, pour it evenly on the rice noodles and sprinkle with chopped green onion.