Beijingers call him bean juice, which is a food fermented from the leftovers of mung bean making vermicelli. Bean juice is made in local snacks, Beijing. At first, it tastes sour, but it will be much better after getting used to it.

Bean juice was originally a patent for the poor in history, because it has a special taste and relieves heat and exterior symptoms. Especially in summer, if you drink two bowls of hot bean juice and sweat, you will have no summer heat. So it is also accepted by the upper class.

Most foreign friends don't accept the taste of bean juice. Or I heard a thing or two before, and I was scared. In fact, after getting used to it, it is really a good thing with low price and suitable for all seasons.

However, I heard that Shanghai people call soybean milk (made of soybeans) bean juice, so there was a misunderstanding after Beijing.