Laozao is a kind of rice wine, also known as fermented grains, sweet wine and sour wine, formerly known as "Yi", which is a characteristic traditional snack in the south of the Yangtze River. Fermented wine, also known as glutinous rice, can help digestion and relieve heat in summer. The main raw material of glutinous rice is glutinous rice, which is very popular because of its simple brewing process, sweet and mellow taste and low alcohol content. But there are still many people who feel very sour and refuse to eat. In the production of some dishes, glutinous rice wine is often used as an important condiment.