Okay, let’s get technical for one second (I promise it’s painless). A meat thermometer is like a secret weapon for confidence. For a rosy, juicy medium-rare, you’re looking for an internal temperature of 130-135°F (54-57°C).
For medium, aim for 140-145°F (60-63°C). And please, please remember to let the lamb rest for at least 5-10 minutes after it comes out of the oven. The temperature will rise another 5 degrees as it relaxes, so pull it off the heat a little early!
The “Doneness by Cut” Cheat Sheet
Different cuts, different rules. A thick lamb chop or rack of lamb is at its absolute peak when the outside is beautifully seared and the inside is a warm, rosy pink. That’s medium-rare, and it’s a classic for a reason.
A leg of lamb is more forgiving. You can go medium-rare for a luxurious feel, or medium if you prefer a firmer texture. A lamb shoulder, on the other hand, loves to be cooked low and slow until it’s fall-apart tender—that’s well over 180°F (82°C). Different ambitions, different temperatures!
