These are really delicious. In case you want to try, here is the recipe.
70 mL milk
60 g sugar
1 pck active dry yeast (or 1/2 cube of yeast)
300 g wheat flour
60 g butter
Prepare a soft dough, let rise for about 1 hour or double size.
Then, knead properly and form 7 pieces, and let rise for about 15 minutes.
In a deep (or medium-deep) pan heat a mixture of 100 mL milk, 30 g sugar, and 20 g butter.
Put the 7 pieces into the pan, and immediately close with a tight-closing lid (never open until done!!). Bring to a strong boil, for just a moment, and then regulate down the heat to mid-head (best done on induction or electric stove, may be hard to avoid burning the crust on a gas stove). For my local stove, I use setting 4 of 8 (max).
After about 20~25 minutes, the dumpling will fill the pan, and are done.
Best served with vanilla sauce, strawberry sauce, or similar.