Boiled green beans need to cook for about 20 minutes, then turn off the heat and simmer for 5 minutes. Green beans belong to the legume family soybean annual climbing herb. According to the color of its cotyledons, it can be divided into two kinds of green skin green kernel soybean and green skin yellow kernel soybean. Green beans are one of China's important food crops, has been five thousand years of cultivation history. In China is widely planted, in the northeast, north China, Shaanxi, Sichuan and the lower reaches of the Yangtze River are produced, green beans is the seed coat for the green soybean, China's green beans are mainly concentrated in the northeast plains, yellow and Huaiyuan plains, the Yangtze River delta and the Jianghan Plain.
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