1, generally 1-2 two purple sweet potatoes, boiled and steamed 10 minutes. Because the density of purple potato is higher than that of sweet potato, the demand for heating time will be longer. Even small purple potatoes need to be steamed for at least 10 minutes to be cooked. It is recommended to eat after steaming.
2, generally 2-4 two purple potatoes, boiled and steamed 15 minutes. This is a common medium-sized purple potato, which can be directly washed and steamed with skin, which is more fragrant than peeling and steaming. In addition, because the density of purple potato is higher than that of sweet potato, it is recommended to steam 15 minutes before eating.
3. Generally, more than 4 pieces of purple potatoes should be boiled in water and steamed for 20 minutes. Four ounces of purple potato is relatively large, and the steaming time needs to be longer, because the steaming time is too short to be fully cooked, and eating raw purple potato is easy to cause food poisoning. It is recommended to boil water and steam for 25 minutes, especially for those weighing more than five ounces for 25-30 minutes.
Water temperature of steamed purple potato
It is recommended to steam purple potatoes with hot water instead of cold water. The reason for this is the following：
1, hot water is steaming quickly in the pot.
Purple potato is heated faster in hot water, but it needs to be cooked slowly in cold water, which is not as fast as hot water, so the steaming time is not as short as hot water.
2. Hot water smells better in the pot.
When the purple potato is boiled in hot water, the skin of the outer purple potato will be tighter and the fragrance of the purple potato will be less lost. In the process of steaming, hot and cold water will gradually lose a lot of fragrance, so steaming is not as good as steaming with hot water.
3. It is sweeter to steam in hot water.
Purple potato contains a lot of starch. When it meets water and high temperature, it will produce amylase to convert sugar. Hot water can enter this state effectively and quickly, but cold water can't, so the purple potato steamed by hot water will be sweeter and more delicious.