Step 1

Peel and the purple sweet potatoes and cut into small cubes. Steam in a wok around 15 minutes or bake in oven for around 20 minutes. Then mash it with a sticker or scoop.

Step 2

Prepare warm water around 35 °C and melt the sugar in. And mix the yeast with the water. Mix well and set aside for around 5 minutes.

Step 3

Prepare the flour in a large bowl. Pour the water with yeast slowly to the bowl with flour and stir with a chop sticker.

Step 4

Then knead the flour into smooth and soft dough. At the very beginning, it might be a little bit sticky.

Step 5

Repeat the above steps, mix flour with mashed purple sweet potatoes to make smooth dough too.

Step 6

Let the two pieces of dough rest for around 1 hour or until the paste ball doubles in size. This process can be done by mixer.

Step 7

Roll the two pieces of dough into two large and thin rounds. And layer the white round underneath and the purple layer on top. Roll up to a cylinder.

Step 8

Cut the cylinder into small sections. Brush some oil on the bottom of each section and put them in the steamer.

Step 9

Bring some water to a boiling and steam for 15 minutes.

Step 10

Turn down the fire and wait for around 5 minutes. Transfer out and serve hot.