1. Peel the purple sweet potato and cut into pieces.
2. The water is boiled on the drawer.
3. Put in the purple sweet potato cubes.
4. Steam for 15-20 minutes.
5. Puree it with a spoon.
6. Go to the toast.
7. Roll it thin with a rolling pin.
8. Spread a layer of purple sweet potato mash and spread evenly.
9. Peel the banana.
10. Cut a quarter to spare.
11. Put in the banana and roll it up.
12. Pinch the edges tightly with your hands.
13. Cut into small pieces.
