Purple sweet potatoes are usually cooked by steaming them for about 15 minutes. The specific time depends on the size of the purple sweet potato and whether it is cut into pieces.

1. Generally, 1-2 taels of purple sweet potatoes are cooked by steaming them in boiling water for 10 minutes. Because the density of purple potatoes is higher than that of sweet potatoes, the heating time will be longer. Even small purple potatoes need to be steamed for at least 10 minutes before they are cooked. It is recommended to wait until the steaming time is full before eating.

2. Generally, 2-4 taels of purple sweet potatoes are cooked by steaming them in boiling water for 15 minutes. This is a common medium-sized purple potato. You can just wash it and steam it with the skin on. It will be more fragrant than steaming it without the skin. In addition, because purple potatoes are denser than sweet potatoes, it is recommended to steam them for 15 minutes before eating.

3. Generally, for purple potatoes with more than 4 taels, it is better to steam them in boiling water for 20 minutes. Purple sweet potatoes that weigh about 4 taels are relatively large and need to be steamed for a longer time. Because the steaming time is too short, they will not be fully cooked. Eating raw purple sweet potatoes may cause food poisoning. It is recommended to wait until the water boils and steam for 25 minutes before eating. If the weight exceeds 5 taels, it is better to steam it for 25-30 minutes before eating.

Water temperature for steaming purple sweet potatoes

It is recommended to use hot water for steaming purple sweet potatoes, and cold water is not recommended. The reasons are as follows:

1. Hot water steams faster

Purple sweet potatoes are heated faster when hot water is put in the pot, while cold water needs to be boiled slowly, which takes a long time. It enters the state faster than hot water, so the steaming time is not as short as hot water.

2. Steaming in hot water will make the purple sweet potato more fragrant

Purple sweet potato in hot water will be instantly exposed to high temperature, and the outer skin of the purple sweet potato will be firmer, and the purple sweet potato will smell better. There is less loss. Hot and cold water slowly loses a lot of flavor during the steaming process, so the aroma when steamed is not as fragrant as when steamed in hot water.

3. Steaming in hot water will make it sweeter

Purple sweet potatoes contain a lot of starch. When exposed to water and high temperatures, amylase will be produced to convert sugar. Steaming in hot water can effectively change the sugar content. Quickly enter this state, cold water cannot, so the purple sweet potato steamed with hot water will be sweeter and more delicious in the end.