When Qin Huai finished making a batch of Four Happiness Rolls, Tan Wei'an started eating the fresh meat mooncake from Zheng Siyuan's previous batch.
As for why Zheng Siyuan would bake a batch of fresh meat mooncakes before business hours—because they were secretly baked by Tan Wei'an, who counted the number of people in Huang's Kitchen who wanted to eat fresh meat mooncakes and baked according to the headcount.
Tan Wei'an felt that the interaction at Huang's was pretty good, and you could self-serve whatever you wanted to eat.
Just as Tan Wei'an was happily devouring the fresh meat mooncakes, the Four Happiness Rolls came out of the oven.
Freshly baked Four Happiness Rolls couldn't immediately show if they were successful; you had to cut them open to find out.
