The pot they used, which was called a yen-tzu, operated on the same principle as steamers do today. It was divided into two layers. The outer layer held water, and the inner layer had holes and held the grain.
當時有一種鍋叫做甗子，分為兩層，外層裝水，裡層有小洞，用以裝穀物，與今天的蒸籠原理相同。