i'm assuming that your comment relates to restaurants serving rarer than medium...
i think it's a pretty common food safety practice... contaminants are usually found on the surface of meat. when cooking whole-muscle cuts, most of those contaminants are killed in the cooking process. this allows you to cook to a lower internal temperature. the process of grinding meat mixes those contaminants throughout the product and so you therefore have to cook to a higher internal temperature for it to be generally considered safe to eat.
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