Walnuts
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Some markets in Zhengzhou City were caught selling walnuts with cement on the inside at one point. The first step was to take out the actual nut from the shell and then sell the insides at a high price.
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Then, they re-filled the shells of the walnuts with paper-covered cement. These faux “nuts” were then sold on the street again, making the markets a second profit – until they got caught in the act, that is.
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