1. Choose sweet potatoes with red hearts, wash and peel them, and then cut them into strips the thickness of your fingers.

2. Put the cut sweet potato strips into water, add a few spoonfuls of salt and soak for about 10 minute.

3. Put the soaked sweet potato strips into the pot and steam for about 20 minutes.

4. Cool the steamed sweet potato strips.

5. Put the dried sweet potatoes into the baking tray and bake in the oven at 80 degrees for 4 hours. Dry sweet potatoes are ready.