1. Wash the purple yam and steam it in a pot.
2. The steamed purple sweet potato is peeled and pressed into a puree.
3. The steamed yam is peeled and pressed into puree.
4. Put an appropriate amount of honey on the purple sweet potato.
5. Press evenly with a spoon.
6. Cut off the four sides of the bread slice.
7. Roll out thin with a rolling pin.
8. Put a layer of mashed purple potato.
9. Put on the yam mud.
10. Roll it up and cut it off.
11. Finished picture.
