2. Wash the skin of sweet potato, dry it carefully, and cut off the head, tail and fibrous roots of small sweet potato.

3. Wrap the sweet potato with aluminum foil paper, instead of wrapping it layer by layer, just wrap it completely. After the two ends are tightened, it looks like a big candy. Send it to the oven to bake at 200 degrees for about 20 minutes before taking it out. If it is a small oven that cannot adjust the temperature, bake it for 15 minutes, and then turn it over and bake it for 15 minutes. (Aluminum foil paper can also be used instead. The sweet potato baked with aluminum foil paper has more moisture, softer and drier. In addition, you can preheat the oven for 2 minutes before baking to make the oven temperature more uniform. ).

4. After taking out and opening the aluminum foil, you will find that there is a little moisture on the sweet potato skin. After removing the aluminum foil, put it in the oven and bake it for 10 minutes (finally, open the aluminum foil and bake it again to prevent the sweet potato from being affected by water soaking). It's time for the sweet potato to stew for about 5 minutes. You can poke it with chopsticks to see if the sweet potato is ripe and soft. Remove the aluminum foil paper and bake it for 5 ~ 10 minutes to remove moisture. Always take it out before burning the skin.