Leg of lamb
Lammstek
58°CRest 15 min
Pull temperature for medium
Butterfly it and the thickness evens out.
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Safe minimum 63°CUSDA
On the grill
A bone-in leg varies enormously in thickness, so parts of it will always be overdone. Butterflied and laid flat it cooks evenly and takes maybe 40 minutes instead of two hours.
Lamb fat sets unpleasantly when cold, so serve it hot and slice it thin, across the grain.