1. Peel the purple potatoes, wash them, and steam them in an electric pressure cooker.
2. Press the steamed purple sweet potato into puree.
3. Put an appropriate amount of purple sweet potato mash into the cake mold and press tightly.
4. Put the mashed purple potato upside down on the plate.
5. Pour in the right amount of plain yogurt.
6. Put a few dried cranberries to decorate.
Tips:If you like sweeter, you can add an appropriate amount of condensed milk to the purple potato mash.
