The best bet is to use a meat thermometer ($6 - $10 at most grocery stores) and remove the roast when the thickest part of the meat reaches 130 - 135 ˚ F. Then let it rest for at least 15 minutes, and this will bring the roast to ideal medium-rare, which is just barely 140˚ F. If you don't have a meat thermometer, you can cook it for 10 minutes per pound, plus another 30 minutes, in a 400˚ F oven.

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