1, the purple potato should be boiled in cold water for 20 minutes.

2. When cooking purple potatoes, you can insert them with chopsticks to see if they are ripe. If they are easy to insert, it means they are cooked. When boiling purple potato, you can put it in a pot with cold water, so that the boiled purple potato is not easy to break the skin. When buying purple potatoes, you can buy small ones. Small purple potatoes taste sweeter and don't take long to cook. There are many ways to eat purple potatoes, which can be steamed or used to cook porridge.