Subtitle content: Add 50 grams of cooked black sesame seeds and beat them into powder. Pour yeast and black sesame powder into the flour, and stir well. Pour in water, knead into flour flakes, and knead into a dough. Let stand for 10 minutes. While waiting, add sugar and black sesame powder to the melted butter, and mix well. Knead the dough for 5 to 7 minutes until smooth. Cut into 12 pieces, knead into balls and put in the steaming tray. Properly adjust the proofing time according to the room temperature, about 15 to 45 minutes, to 1.5 times larger. Put cold water in the pot, steam on medium heat for 15 minutes after airing, and slowly open the lid for 5 minutes after turning off the heat.