Jinnan laozao is a traditional Han snack in Shanxi. This kind of dessert is well known. The food stall that first appeared in Hongdong City at the southern foot of Huoshan Mountain has a history of hundreds of years. Every year at the temple fair on March 18th of the lunar calendar, there are endless streams of tourists and a sea of people, so the mash to quench thirst and produce saliva arises at the historic moment. Hongdong mash is famous because it uses living spring water and glutinous rice irrigated with this water, and because it uses a unique cooking stove and a unique brewing method.