Add salt after boiling the soup. It is not advisable to add salt first when making soup, because salt has an osmotic effect and will drain out the water in the raw materials. If the food is meat, it will easily lose water and shrink in advance, making it difficult to stew the soup to bring out the delicious flavor and aroma, and the protein will solidify. , lack of umami flavor, so it is recommended to add salt to the soup 5 minutes before serving. The salt can not only be well integrated into the soup, but also taste delicious and palatable.