Put all the ingredients in the bread tube, except for the butter, set the dough for 20 minutes. After mixing for 20 minutes, add butter and continue mixing for 20 minutes for fermentation. Ferment to 2 to 2.5 times. Exhaust air in 7 small groups to wake up for 15 minutes. Take a dough and flatten it and place it on the mashed purple potato. Flatten the dough and cut 8 times with scissors. Put the finished flower buns in a baking tray for secondary fermentation.

　　 fermented to 2 times, coated with egg liquid, put black sesame seeds, preheated the oven at 180 degrees for 5 minutes, put in the bread and bake for 20 minutes. Let cool in the oven for 20 minutes.

　　 Two: Peel the purple sweet potato and steam it in the basket. Put the sugar in while it is hot and grind it as finely as possible. Order the amount of sugar yourself. Wait for it to cool down. Stir in the yeast that melts the milk. After mixing together. Knead with flour to form a smooth dough. Let stand for twenty minutes. Cut a piece of dough with a knife. Rub into long strips. Such a long strip requires three strips.

　　 Then roll it flat with a rolling pin, try to make it as thin as possible, the flowers will look better. This process, assuming that the dough is sticky, can be sprinkled with some dry flour. First take a long strip and fold it into a flower heart by hand. Take another long strip, cut a section, and fold it into flower pieces. Need to fold more than four flower pieces. Fold the remaining dough pieces in this way. Dip each flower piece with a little water, and stick it around the flower heart. Then, the raw embryo is like this, and it can be placed in a cake mold. Steam for ten to fifteen minutes.