1. Wash the sweet potato for later use. Don't peel it. It is best to use a toothbrush to wash, flush and brush at the same time. This will make it cleaner and then drain a lot of water from the sweet potato.

2. Cover the grill with tin foil and put the cleaned sweet potatoes on the tin foil.

3. Preheat the oven at 2 10 degree for 10 minute, then put the sweet potatoes in the middle layer of the preheated oven and bake at 2 10 degree for about 80 minutes (the baking temperature and time are for reference only, and are adjusted according to the size and quantity of sweet potatoes).

4. Bake until the sweet potato oozes sugar juice.