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. 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.

Fermented grains, also known as fermented grains, distiller's grains, rice wine, sweet wine, sweet rice wine, glutinous rice wine, fermented rice wine and rice yeast, are a kind of flavor food made from glutinous rice or rice by yeast fermentation, with high calories. Rich in carbohydrates, protein, B vitamins, minerals, etc. North and South have different names.