Secret to the best Ultimate Slow Roast Lamb: 3 Tips
Master our Ultimate Slow Roast Lamb recipe! Get tender, juicy, fall-off-the-bone lamb perfect for a Sunday roast. Discover the simple method and the three essential tips for guaranteed success.
Ingredients
- 1 bone-in leg of lamb approximately 5 lbs (2.2kg)
- 1 head garlic cloves separated and peeled
- 4 sprigs fresh rosemary
- 2 tbsp olive oil
- 1.5 tsp coarse sea salt
- 1 tsp freshly ground black pepper
- 2 large onions peeled and quartered
- 2 cups beef or lamb stock or a mix of stock and red wine
Instructions
- Tip 1: Bring to Room Temperature. Remove the lamb from the refrigerator at least 1 hour before cooking. Pat it completely dry with paper towels. This ensures the lamb cooks evenly from the start. Preheat your oven to 325°F (160°C).
- Tip 2: Score & Infuse Flavor. Using a sharp knife, make small, deep incisions all over the lamb, about 1-inch apart. Cut some of the garlic cloves into slivers. Pick the leaves from 2 rosemary sprigs. Stuff a sliver of garlic and a few rosemary leaves into each incision, pushing them deep into the meat.
- Scatter the quartered onions and the remaining whole garlic cloves and rosemary sprigs into the bottom of a large, deep roasting pan to create a natural rack for the lamb.
- Rub the entire surface of the lamb with olive oil. Season very generously all over with the coarse sea salt and freshly ground black pepper, rubbing it into the skin.
- Place the seasoned lamb on top of the onions in the roasting pan. Pour the stock (and/or red wine) into the bottom of the pan, being careful not to wash the seasoning off the lamb.
- Tip 3: Low & Slow, Covered. Cover the roasting pan tightly with a double layer of aluminum foil. This traps the steam and moisture, which is key to tender, fall-off-the-bone meat. Place in the preheated oven.
- Roast for 4 hours, basting the lamb with the pan juices every hour. After 4 hours, remove the foil. Increase the oven temperature to 400°F (200°C) and roast for a final 20-30 minutes, or until the skin is golden brown and crisp.
- Crucial Final Step: Rest the Meat. Carefully transfer the lamb to a warm cutting board or platter. Cover it loosely with foil and let it rest for at least 20-30 minutes before carving. This allows the juices to redistribute throughout the meat, ensuring it's succulent and not dry. Do not skip this step!
- While the lamb rests, you can make a gravy from the pan drippings. Strain the liquid from the roasting pan into a saucepan, skim off the excess fat, and simmer until thickened. Serve the tender lamb with the pan gravy.
Notes
Pan Gravy Tip: For a richer gravy, after straining the pan juices, you can create a slurry with 1 tablespoon of cornstarch and 2 tablespoons of cold water. Whisk this into the simmering juices until the gravy thickens to your desired consistency.
Serving Suggestions: This lamb is perfect served with creamy mashed potatoes, crispy roast potatoes, mint sauce, and steamed green beans or roasted carrots.
Storage: Leftover lamb can be stored in an airtight container in the refrigerator for up to 3 days. It's delicious in sandwiches, salads, or shepherd's pie.
