For the folded shape, roll each ball of dough into an oval, brush it thinly with oil, and fold it over a chopstick. The oil keeps the halves from sticking together while they steam. After steaming, wait 3 minutes before you open the lid, or the buns collapse from the temperature shock and wrinkle.
You braise the pork belly while the dough rises. If you like closed, filled buns, you find the technique in the baozi recipe. Rolled Japanese pork belly from the chashu recipe also works as a filling.
