Old Beijing bean juice smells sour? It's actually healthy food.

Experience local snacks are a must when traveling. If you're in Beijing, you might go to the front door fence, the National Guard Temple or the Longfu Temple to experience the flavor of the old imperial city. There you'll see a snack called bean juice, with coke rings and pickles, a bit of a "soy milk bar".
but bean juice is a dark dish for those who can't accept its taste, and the difficulty factor of drinking a bowl of bean juice for the first time is not low. This is because the old Beijing bean juice has a sour smell similar to water, people who do not like to drink it is often described as "soy milk."
the soy milk at home turn into soy juice? Not. In fact, it's making mung bean starch, fans, powdered bottoms, and breakfast soy milk are two different things.
bean juice belongs to the natural fermentation of soy products, scientists from Dongjimen bean juice shop, Longfu Temple bean juice shop, old magnet mouth bean juice shop respectively collected samples, through DNA sequencing to identify the microbial composition. It was found that the main fermentation microorganisms were lactobacillus lactic acid, in addition to lactobacillus lactobacillus, streptococcus, Bacillus acetate and other microorganisms involved in the fermentation process of soy juice.
the fermentation of bean juice and yogurt are the same, the flavor is far more complex than those in supermarkets due to the presence of germs. After the detection of modern scientific instruments, there are at least 40 kinds of flavor substances in bean juice, mainly a variety of alcohol substances, followed by organic acids, aldehydes, ethers.
some old Beijing especially like to drink bean juice, but also like to go to a specific bean juice shop to drink, which also has a scientific reason. The fermentation process and fermentation environment of different stores are different, resulting in different fermentation microorganisms, and the flavor substances produced by fermentation are also different. For example, there are more soy juice alcohol substances in the Temple of the Guard, while the aldehyde substances in the old magnet mouth bean juice are relatively abundant.
bean juice produces acid odor is mainly organic acids, sulfur compounds and furans and other substances, especially methanol, methyl thiol, furans, only a very low concentration can let you smell a special "stimulus" taste. Cooked bean juice after cooking, a lot of sour odor ingredients will evaporate, retained flavor substances are mainly organic acids, aldehyde substances, the taste has become relatively "soft."
if you still can't accept the taste, try another traditional snack, hemp tofu. It's a by-product of boiled bean juice, fried in goat's oil, and tastes much milder than bean juice.
, although the bean juice smells of water, but in fact the safety is good, because lactic acid bacteria fermentation pH rapidly reduced, pathogenic bacteria difficult to survive. As a fermented food, soy juice is also rich in nutrition and easy to digest, is a healthy food. For example, its protein content can reach more than 4 grams per 100 milliliters, more than most milk "high protein." Of course, if you can't accept bean juice because of the taste, choose to drink milk. (Zhong Kai)