Step #4 Add remaining flour slowly until the dough comes away from the sides of the bowl.
Step #5 Turn out onto a lightly floured surface & knead until smooth & elastic, about 2-3 mins.
Step #6 Place In a large-ish ziploc bag to rise (or a bowl, covered with plastic wrap) until doubled, 45-60 mins.
Step #7 Cut 12 3-inch squares of parchment paper.
Step #8 Turn dough out onto a lightly floured surface & flatten.
Step #9 Divide dough into 12 pieces.
Step #10 Keeping the unused pieces of dough covered with a dish towel, flatten a piece of dough into a circle with the center slightly thicker than the outside (approx 4-5 inches in diameter).
Step #11 Place about 2 tbsp filling in the center of the dough & close the dough around the filling, pinching to seal.
Step #12 Place seam-side down on a square of parchment & place on a baking sheet.
Step #13 Repeat with all dough.
Step #14 Cover up baking sheet with a clean dish towel & let rise for 15-20 mins.
Step #15 Steam buns for 18-20 mins, in batches if necessary, until springy to the touch.