1. Main ingredients: appropriate amount of lotus root meatballs. Accessories: 20 grams of egg white, 5 grams of salt, 10 grams of light soy sauce, 5 grams of oyster sauce, 2 grams of sugar, a little pepper, a little ground ginger, and 30 grams of starch.

2. Use tomato sauce, rice vinegar, sugar, light soy sauce, salt, and water starch to prepare a bowl of sweet and sour sauce.

3. There is no need to pour oil into the pot. Pour the prepared sweet and sour sauce directly into the pot and bring to a boil.

4. Use a spatula to stir the sweet and sour sauce to prevent it from sticking to the bottom.

5. Pour in the steamed meatballs and stir-fry evenly to reduce the thick soup and serve.

6. Put the sweet and sour meatballs on a plate and sprinkle with chopped green onion and they are ready.