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Is the bottom of Chengdu Hotpot Restaurant disposable?

The hot pot in Chengdu is basically disposable, but only the old hot pot in Chongqing is not. This is their difference. Chongqing hot pot is called old hot pot because the bottom of the pot is used repeatedly. Rongcheng's mom's Chengdu hot pot market is very strict, and she dare not use waste oil.