Brown Sugar Sesame Steamed Buns

First, dissolve 50g brown sugar in 250g hot water. Let it cool down a bit. Then, mix this liquid with 500g flour and 5g instant yeast to form the dough. Let the dough rise. Once risen, cut it into 8 equal parts. For the filling, combine 100g black grounded sesame with 50g brown sugar. Roll each dough portion and spread the black sesame filling inside, adjusting the amount to your preference. Cut through the dough (presumably to create a swirl or design) and let the buns rise for another 20 minutes. Just before steaming, pour extra brown sugar on top of the buns. Steam the buns for 15-20 minutes until cooked through.