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In a small bowl, combine 1/4 cup extra virgin olive oil, 8 cloves garlic (minced), 3 tbsp fresh rosemary (finely chopped), 2 tbsp fresh thyme (finely chopped), 1 tsp dried oregano, zest of 1 large lemon, juice of 1/2 large lemon, 2 tsp kosher salt, and 1 tsp freshly ground black pepper. Mix well to form a fragrant paste.
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Pat the 1 (5-6 lb) bone-in leg of lamb dry with paper towels. Make small incisions all over the lamb with a sharp knife. Rub the prepared herb paste generously over the entire surface, ensuring it gets into the incisions. This is key for a flavorful How to Roast a Leg of Lamb for a Stunning Main Course.
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Preheat oven to 425°F. Place 2 large yellow onions (cut into 1-inch wedges) in the bottom of a large roasting pan. Pour in 1 cup dry red wine and 1 cup beef broth. Place the seasoned leg of lamb directly on top of the onions in the roasting pan.
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Roast the leg of lamb in the preheated oven at 425°F for 20 minutes. This initial high heat will create a beautiful crust on the exterior of your How to Roast a Leg of Lamb for a Stunning Main Course, locking in the juices and developing rich flavor.
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Reduce oven temperature to 325°F. Continue roasting for an additional 90-100 minutes, or until an internal temperature of 130-135°F for medium-rare (or desired doneness) is reached with a meat thermometer. Baste occasionally with pan juices.
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Transfer the roasted leg of lamb to a cutting board, tent loosely with foil, and let it rest for at least 15-20 minutes before carving. This resting period is crucial for the juiciest How to Roast a Leg of Lamb for a Stunning Main Course, allowing the juices to redistribute.
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Carve the rested leg of lamb against the grain into thick slices. Arrange on a platter with the roasted onions and drizzle with the flavorful pan juices. Garnish with fresh mint sprigs and a sprinkle of flaky sea salt, if desired. Serve immediately!