1. Steam the small purple potato in a steamer for about 1 minutes. If you can pierce through with chopsticks, you can go out of the pot.

2. If it is a big purple potato, steam it for about 15 minutes! If you want to steam faster, you can cut the purple potato into several pieces.

3. The exact time still depends on the firepower. Therefore, insert it with chopsticks in about 1 minutes, subject to complete penetration.