Water is definitely to put, but and boiled yam is different, steamed yam need to steam across the water, the water can not diffuse over the yam. So that the steamed yam has a good taste and flavor. And steamed yam time must be controlled. Generally speaking, fifteen to twenty minutes is enough. The length of time also depends on the size of the yam and fire and other conditions, if you are not sure whether the yam is cooked, you can use chopsticks to poke, if it is easy to poke in, then it means that the yam is cooked.

Two, the benefits and disadvantages of yam

1. Yam is rich in amylase, etc., eat more yam can promote digestion and absorption.

2. Yam is also rich in vitamins and trace elements, high nutritional value.

3. Yam is an allergy-prone ingredient, so if you are allergic, you may have to stay away from it or be careful with it.

4. Yam is high in starch, so it's easy to eat too much of it to cause constipation, and high-calorie yam is not suitable for girls who want to lose weight to eat too much.