Creating a perfect leg of lamb involves specific steps to ensure that the meat is tender and flavorful. Follow these instructions carefully:

1. Preheat Your Oven: Preheat your oven to 450°F (232°C).
2. Prepare the Marinade: In a bowl, mix minced garlic, chopped rosemary, thyme, salt, pepper, olive oil, and lemon juice to form a paste.
3. Score the Lamb: Lay the leg of lamb on a cutting board. Use a sharp knife to score the meat in a criss-cross pattern lightly. This allows the marinade to penetrate.
4. Marinate the Meat: Rub the garlic and herb mixture generously all over the lamb, making sure to get into any scored areas. Let it marinate for at least 30 minutes at room temperature or overnight in the refrigerator for deeper flavor.
5. Prepare for Roasting: Place the marinated leg of lamb in a roasting pan. If using vegetables, arrange them around the lamb.
6. Add Broth: Pour the chicken or vegetable broth into the bottom of the roasting pan. This will help keep the meat moist during cooking.
7. Roast: Place the lamb in the preheated oven and roast for 20 minutes at 450°F. Then, lower the temperature to 325°F (163°C) and continue roasting for an additional 1.5 to 2 hours or until a meat thermometer registers 135°F (57°C) for medium-rare.
8. Rest the Meat: Once done, remove the lamb from the oven and let it rest for 15-20 minutes, covering it loosely with aluminum foil. This step is crucial for juicy meat.
9. Carve and Serve: After resting, carve the lamb against the grain into thick slices. Serve with the roasted vegetables and pan juices.

With these instructions, you will achieve an incredible flavor that makes leg of lamb a standout dish for any occasion!