Purple Potato Cake
1.
Peel the purple sweet potato.
2.
Dice into the steamer and steam until cooked and soft.
3.
Add butter, sugar and rose sugar over the heat and mix well.
4.
Compression molding with mold.
5.
Put it in a small box and put it in the refrigerator overnight to taste better.
6.
Be sure to close the lid, it's very delicious.