In this July 27, 2012 photo, U.S. Chef Christopher Kostow holds a watermelon as he visits Mercado San Juan Pugibet, the most gourmet market in Mexico City. (AP Photo/Alexandre

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In this July 27, 2012 photo, U.S. Chef Christopher Kostow holds a watermelon as he visits Mercado San Juan Pugibet, the most gourmet market in Mexico City. (AP Photo/Alexandre Meneghini) less