1. After removing the sediment on the surface of purple potato, rinse it with clear water and peel it.

2. Cut the peeled purple yam potato into pieces about 3 mm thick. After cutting, you need to put it directly into 0.5% sodium bisulfite solution, take it out two hours later, rinse it with clean water after taking it out, and then cook it in boiling water for 6 to 8 minutes.

3. When making potato chips with purple yam feet, be careful not to make them too bad. After cooking, take it out and drain the water, put it into a dryer to dry, and finally use a pulverizer to directly grind the dried purple yam potato chips into powder. At this time, we will make our own purple yam foot potato powder.