Preparation of raw materials: three hand-held cakes, three purple potatoes, one egg yolk, a little black sesame seeds, and a proper amount of condensed milk

Steps:

1. Bake the purple potatoes in the oven at 22 degrees for 4 minutes, peel them, add condensed milk, press them into mud, divide them into 9 parts, and knead them into balls. The purple potatoes are sweet enough, and no sugar is needed.

2. Roll the cakes into strips, cut each cake into three sections and knead them into balls.

3. Flatten the cake dough, put it in purple potato balls, seal it down and flatten it slightly, decorate it with a knife, brush with egg yolk liquid and sprinkle with black sesame seeds.

4. Preheat the oven at 18 degrees, and bake it at 18 degrees for 2 minutes.