Preparation materials: appropriate amount of sweet potato, microwave oven.

Step 1: Choose long red sweet potatoes, wash them and soak them in salt water for one hour, without wiping water.

Step 2: Wrap two layers with wet kitchen tissues.

Step 3: Put it in the microwave oven, and it will sting for 8 minutes, then turn over and sting for 3 minutes.

Step 4: Take out and remove the paper.

Step 5: finished product.