1. Wash and grate the yam, cut into long pieces of suitable size; soak in lightly salted water for 5 minutes, then lift up and drain.

2. Wrap the yams tightly with tin foil separately.

3. Preheat the oven to 220 degrees Celsius and bake in the center, upper and lower heat for 20 minutes. (You can take them out and turn them a few times to prevent them from burning)

4. Remove the foil and bake for another 10 minutes. Remove the yams from the oven and dip them in sugar cinnamon.