1. Waterproof stewing is a method of making ingredients by putting them into a container of appropriate size and stewing the container in water. Because the space in the container is closed, this method can keep a certain amount of heat and pressure in the container, so that fresh and fragrant substances such as protein can be dissolved but not dispersed, and the original flavor of the ingredients can be better maintained. However, due to the limited capacity of the container, the ingredients cannot roll in the container, so this method is more suitable for making clear soup.

2. Direct stewing means stewing the ingredients directly in water. Because this method is no longer limited by the size of the container, it can be used to make relatively large pieces of ingredients, and the soup stewed directly is thicker than the soup stewed with water.