Preheat your oven to 275°F (135°C). Place your leg of lamb on a cutting board and pat it dry with paper towels to remove excess moisture.
Mix together minced garlic, chopped rosemary, olive oil, salt, and black pepper in a large bowl to form a fragrant herb paste.
1 bone-in leg of lamb
Rub the herb mixture all over the lamb, ensuring it’s evenly coated on all sides for maximum flavor.
1 bone-in leg of lamb
Transfer the lamb to a roasting pan, bone side down, and cover loosely with foil to keep it moist during cooking.
1 bone-in leg of lamb
Slow roast the lamb in the oven, allowing it to cook gently for about 3 hours or until the internal temperature reaches 135°F (57°C) for medium-rare, or longer for desired doneness. Baste occasionally with juices from the pan.
Remove the foil during the last 30 minutes of roasting to let the exterior develop a crispy, golden crust.
Once cooked, transfer the lamb to a cutting board and let it rest for 15-20 minutes; this helps the juices evenly redistribute inside the meat.
Carve the lamb into thick slices, revealing tender, juicy meat with a crusty exterior.
Serve the sliced lamb alongside your favorite sides, enjoying the rich aroma and melt-in-your-mouth texture.