Once the dough is doubled in size, gently punch it to remove the air trapped inside of it.
Transfer it to a well dusted surface and knead for a minute. Then divide the dough into 8 parts.
Roll out all the 8 parts into rudimentary circles and keep them aside.
Check on your red bean paste, and divide them into lemon sized balls. Now, flatten the dough balls in your palm or on the work surface.
Place the bean paste ball on the flattened dough.
Seal it by bringing in the sides to the centre and pinching them together.
Turn it upside down, and flatten it just a little bit. Now with a pair of scissors, cut the ball into 8 parts leaving the centre intact, like shown in the picture.
Place it on a prepared baking dish. Prepared baking dish as in line it with a parchment sheet or if you don't have that at hand, rub butter or ghee well onto the plate. Sprinkle with sesame seeds on the centre, and brush with milk. Let it sit for 20 minutes.
When the buns are proofing (resting), preheat your oven to 200 deg C, and bake the buns for 25 minutes. Take them out, brush them with a little bit of butter and bake at 180 deg C for 4 minutes.