1. Boil the hot oil in the pan, add minced garlic to turn yellow slightly, add tomatoes, light soy sauce and oyster sauce and stir-fry until fragrant.

2. Add ginger and water to boil, add sugar and salt to taste, and finally add red vinegar and white vinegar. Turn off the fire and add chopped green onion.

3. The prepared cold noodle juice should be cooled and put in the refrigerator for one hour.

4. soak the sweet potato powder in cold water first. Drain the water and cook the eggs in boiling water. Pick up the sweet potato powder and let it cool.

5. Sweet potato powder in the bowl. Cut the egg in half, slice the ham and sausage, and arrange the cucumber shreds.

6. Serve with cold noodle sauce.