Add some bitter powder to the flour, buy more links to bitter powder: https://www.xiachufang.com/goods/75839/
The yeast is heated and hydrated;
Mix bitter buckwheat flour and flour in a ratio of 1:4;
Mixed flour and fresh milk plus yeast water and dough;
Cover the lid and ferment for 20 minutes to 2 times the size;
Put the flour into the chopping board, knead the fermented dough and vent it until the dough is smooth;
Divide into dough of the same size and knead the dough into round buns;
Add water to the pot, put the steamed buns in the cage, cover the lid, steam for 13 minutes, turn off the heat, and uncover it in 3 minutes.