First, boil some water in the pot. In this process, take out a bowl to make ingredients. It contains vinegar, soy sauce, salt and pepper. You can decide the quantity according to your taste. Then, cut half an onion into small pieces and add some coriander. Then, put them in the bowl. After the water is boiled, put the meatballs into the pot until they float on the water. Finally, put the ingredients into the pot and stir with a spoon for a few minutes, and the soup is ready.

Now, you can taste this simple and delicious soup.