Cut out 8 individual 4 inch (10 centimeter) squares of parchment.
Once doubled in size, transfer the dough to a lightly floured surface.
Divide the dough into 8 equal pieces. Form each piece into a smooth ball. Cover any pieces you aren't currently using with a towel.
Use a rolling pin to roll a ball into a circle about 4 inches (10 centimeters) wide, keeping the center thicker than the edges.
Use a small cookie scoop or spoon to add a tablespoon of the black sesame paste to the center of the circle.
Pleat the edges over the filling and pinch the tops together to seal, twisting gently.
Place the sealed bun on one of the cut out squares of parchment, sealed side down, then repeat with remaining dough and filling.
Lightly wet the back of each cut-out panda piece with a little water and gently press down on the prepared buns to make the panda faces.
Cover the buns with a towel and set aside for 30 minutes at room temperature, until puffed.
Fill a wok with water, keeping it low enough to not touch the bottom of the steamer. Bring the water to a boil, then reduce heat to medium.
Arrange the puffed buns on the parchment into two steamer baskets about 2 inches (5 centimeters) apart, cover with the top, then place over the water.
Steam the buns for 12 minutes.
Turn off the heat and allow to cool for 5 minutes untouched in the steamer before removing the lid.
These Black Sesame Buns are best served warm.