Generally, it can be steamed in 15-20 minutes. Steamed yam and steamed sweet potato are about the same size, and the length of time required is mainly related to the consumption, pot and firepower. But in general, if you put 3 to 5 pieces of yam with appropriate size and steam them in a household stainless steel steamer, it will be cooked in 15-20 minutes. If you are not sure whether it is ripe, you can poke the surface of the yam with chopsticks, and the one that is easy to poke is ripe.

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Yam is influenced by regional climate characteristics, geological characteristics, growth habits and other factors, and has different origin characteristics. Yam is mainly produced in Aibo, Wuzhi, wen county and other places in Henan, and also cultivated in Shaanxi, Shandong, Hebei, Zhejiang, Hunan, Sichuan, Yunnan, Guizhou and Guangxi. Guangxi, Hebei, Henan and other major producing areas constitute the main planting areas of yam.