Prepare the sweet potato paste or use pre-made paste. Gather all ingredients.

In a bowl, whisk the egg and mix with sugar, salt, and corn syrup. Heat the mixture in a double boiler until dissolved.

Add cake flour and baking powder to the mixture and knead into a dough.

Wrap the dough in plastic wrap and refrigerate for 20–30 minutes.

Divide the dough into 25g portions and the sweet potato paste into 45g portions.

Shape the dough around the sweet potato paste into round balls.

Use a toothpick or chopstick to create petal-like lines on the sides of the dough balls.

Press the center of each ball lightly with a teaspoon to create a flower shape. Spray lightly with water and let dry.

Brush the tops with egg wash and sprinkle black sesame seeds in the center.