In a mixing bowl, combine flour, sugar, salt, and yeast.

Gradually add milk and mix until a dough forms.

Knead the dough for about 10 minutes until smooth.

Let the dough rise in a warm place for 1 hour.

Divide the dough into small balls.

Flatten each ball and place a spoonful of filling in the center.

Seal the dough around the filling and shape into a bun.

Place the buns in a steamer and steam for 15 minutes.