Bean juice is a unique snack in old Beijing, which has a history of 300 years according to written records. Bean juice is made from mung beans. After starch is filtered out to make vermicelli and other foods, the remaining residue is fermented, which has the effects of nourishing stomach, detoxifying and clearing fire.

When it comes to Beijing snacks, it first reminds people of bean juice. Beijingers love to drink bean juice and regard it as a kind of enjoyment. But the first time you drink bean juice, the smell like swill makes it difficult to swallow. If you hold your nose and drink it twice, you will feel different. Some people are addicted to it, looking everywhere and waiting in line to drink.