Safe internal temperatures and doneness targets — the only reliable doneness test.
Target
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Safe minimum
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Use a meat thermometer in the thickest part, away from bone or fat. Temperatures below
follow USDA safe-minimum guidance; "doneness" temps for beef and lamb are culinary preferences
above the safe minimum. Rest meat after cooking — the temperature keeps rising several
degrees (carryover).
For food safety, the USDA sets minimum internal temperatures: 63 °C (145 °F) for whole
cuts of beef, pork and lamb (with a 3-minute rest), 71 °C (160 °F) for ground meats,
and 74 °C (165 °F) for all poultry. Steak "doneness" levels (rare, medium and so on)
are personal preference — just note that rare and medium-rare beef sit below the safe minimum,
which is generally accepted for whole, intact cuts but not for ground meat or poultry.