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 can help digestion and relieve summer 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.

Thick wine is a characteristic farmer's self-made wine in northern Shaanxi. People in northern Shaanxi also call it "sweet wine" and "mud wine", and because there is a stage of steaming into cakes in the production process, it is also called "cake wine" The taste of strong wine varies from household to household, because the degree of sweetness and sourness is different. There are differences in both raw materials and processes.

Lao Zao refers to the wine made by mixing wine pulp and distillers grains. It is made by fermenting rice and wine. Slightly sweet and mellow, its nutritional value and edible effect far exceed that of wine. It is a good product for postpartum nourishing. The alcohol content of mashed mash is lower than that of wine. Rice wine is fermented from rice and koji, which is clearer and has higher alcohol content.