The second room temperature 15 minutes is called relaxation, which I think is to ensure the uniformity of plastic surgery.
The third time is the final fermentation.
Generally, the basic fermentation needs to be twice as large, and it will continue to ferment for about 2 times after setting. According to the current room temperature, it takes about 1.5-2 hours.
After the first fermentation, it must not be shaped and baked, because the air has been exhausted during the shaping process, and the effect is probably similar to that of scones.
The first fermentation after molding should also be impossible, because other auxiliary materials may be added in the later molding, which will affect the fermentation, and the fermentation is uneven at this time, and the pores in the dough are large and small.
Steamed bread tastes tight, not as soft as bread, and it will be easier to make.