See variety:

The thicker dumpling buns,
the plain steam buns,
the fried steam buns,
the colored steam buns,
(usually sweeter, the flour is mixed with other food addictives, such as green tea, egg yolk; the buns are occasionally filled with red bean paste),
minced-pork veggie buns,
and the steam buns with fillers
(usually with veggies and flavored meat).