Add the instant yeast and sugar to the lukewarm water and let it become bubbly and ready to go. This takes about 5 minutes.
Add the sifted flour to a bowl and make a hole in the middle. Pour in the yeast water and start bringing the dough together. You can kneed it with a food processor using the right attachment or by hand for about 5 to 8 minutes.
Place it back in the bowl and cover it with a clean tea towel and let it rise for about 60 minutes or until doubled in size.
Punch the air out, kneed it through a few times and form a log shape. Divide the dough into 12 equal pieces, you can eyeball this or use a scale. Form balls.
Flatten the dough ball and add a scoop of filling in the middle, 1/12th of the filling. Pinch the up and down side of the round circle together, do the same in the middle of the other half. Start pinching the dough together to close it completely.
Cover the ready to steam buns with a tea towel and finish rolling and filling all the dough. While you are doing this yo can heat some water in the pan you are going to be using to steam above.