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The old machines at the flour mill were indeed a bit old, but still usable. The smaller sweet potatoes didn't need to be chopped; they just needed to be poured into the top of the machine, which had two modes of grinding: coarse mixing and fine milling.
Feng Xing did some research and decided to start by coarsely milling a few white potatoes. The milling machine made a noise like a cement mixer as it chopped the whole sweet potatoes into irregular chunks. After Zhuo Feng and Xiao Xian caught them in a bucket and inspected them, Zhuo Feng wondered:
"Isn't it right to peel them before processing?" He was worried that the broken skins would affect the appearance of the flour.
"The nutritional value of sweet potato skins is high, and besides, we'll process them finely later, at which point those skins will be long gone," Xiao Xian calculated that if they had to peel them before making flour, the cost of labor would be astronomically high.
