Sunday roasts were a weekly tradition in my Cincinnati home, and this slow-roasted leg of lamb brings that same warmth to my Portland kitchen. The secret lies in patience—letting the meat cook low and slow until it’s fall-apart tender.
Rosemary and garlic work their magic as they infuse every bite with aromatic depth. I learned early on that quality lamb from local butchers makes all the difference, as does giving it time to rest before serving.
This method transforms a simple cut into a showstopping centerpiece worthy of any gathering. The meat stays juicy while developing a rich, caramelized exterior that’s impossible to resist.
The best part? Your kitchen will smell like a celebration long before the first slice is served.
Ingredients for Slow Roast Leg of Lamb Recipe Jamie Oliver
Quality lamb, fresh herbs, and bold flavors make this slow-roasted dish unforgettable every time.
| Ingredient | Amount | Notes |
|---|---|---|
| Bone-In Leg of Lamb 🐑 | 5 lb | At room temperature before cooking |
| Fresh Rosemary Sprigs 🌿 | 6 whole | Plus extra for garnish |
| Garlic Cloves 🧄 | 8 cloves | Smashed, unpeeled |
| Extra-Virgin Olive Oil 🫒 | ⅓ cup | Plus extra for drizzling |
| Kosher Salt 🧂 | 1 tbsp | Diamond Crystal preferred |
| Black Pepper 🌶️ | 1 tbsp | Freshly cracked preferred |
| Dijon Mustard 🟡 | 2 tbsp | For crust and flavor |
| Lemon 🍋 | 1 whole | Zested and juiced |
| Red Wine 🍷 | 1 cup | Dry variety for deglazing |
| Chicken Stock 🥣 | 1 cup | Low-sodium preferred |
| Honey 🍯 | 2 tbsp | For glaze and balance |
| Carrots 🥕 | 4 whole | Cut into chunks |
| Yellow Onion 🧅 | 1 whole | Quartered for roasting |
The lamb is everything here. Local butcher shops or Whole Foods carry the best bone-in legs—look for vibrant pink color and good marbling. I always ask for the shank bone to be left on; it adds flavor and makes carving easier. Rosemary should be fresh (dried just doesn’t cut it), and the garlic? Big, plump cloves from a head you peel yourself. Quality olive oil matters—California Olive Ranch is my go-to.
No red wine? Beef broth with a splash of balsamic works in a pinch. Fresh out of Dijon? Whole-grain mustard adds a nice texture. If the honey feels too sweet, maple syrup at the same amount keeps the glaze. The carrots and onion can be swapped for potatoes or parsnips (cut similarly). Short on rosemary? Fresh thyme plus a bay leaf gets you close.
Leftovers taste even better the next day. Store in the fridge for up to 4 days or freeze for 3 months. Reheat gently in the oven to keep the meat moist. The fat solidifies when cold—perfect for skimming off if you’re making gravy.
Why You’ll Love This Recipe
- Hands-Off Cooking: I just rub the lamb with oil, salt, rosemary, and garlic, then let the oven do all the work for hours.
- Fall-Off-The-Bone Good: The slow roasting turns the meat so tender, the garlic and rosemary infuse every bite.
- Sunday Roast Hero: It’s my go-to for family dinners, birthdays, or even a fancy weekend lunch.
- Leftovers for Days: One roast gives us sandwiches, curries, and tacos all week—no waste, just flavor.
Step-by-Step Instructions for Slow Roast Leg of Lamb
Here’s how I achieve tender, fall-off-the-bone lamb with a fragrant rosemary-garlic crust every time.
Step 1: Prepare the Lamb with Aromatic Marinade
Begin by patting the 5 lb Bone-In Leg of Lamb dry with paper towels to ensure a good sear. In a small bowl, combine the 0.33 cup Extra-Virgin Olive Oil, 2 tbsp Dijon Mustard, 1 tbsp Kosher Salt, and 1 tbsp Black Pepper. This creates a flavorful base that will cling to the meat.
Strip the leaves from 4 of the 6 whole Fresh Rosemary Sprigs and finely chop them, then add to the oil mixture. Smash the 8 cloves Garlic Cloves (leave the skins on) and press them into the meat. Rub this marinade all over the lamb, making sure to get into every crevice. Let it sit at room temperature for 30 minutes to absorb the flavors.
Step 2: Sear and Build the Roasting Pan Foundation
Preheat your oven to 325°F. Heat a large Dutch oven or roasting pan over medium-high heat. Sear the lamb on all sides until deeply browned, about 3-4 minutes per side. This step locks in juices and creates a rich fond for your sauce.
Remove the lamb and set it aside. In the same pan, add the 4 whole Carrots (cut into chunks) and the 1 whole Yellow Onion (quartered). Sauté for 5 minutes until they begin to caramelize around the edges. This builds a flavorful base for your braising liquid.
Step 3: Deglaze and Begin the Slow Roast
Carefully pour in the 1 cup Red Wine to deglaze the pan, scraping up all the browned bits with a wooden spoon. Bring to a simmer and cook for 2 minutes to reduce slightly. Stir in the 1 cup Chicken Stock, 2 tbsp Honey, and the juice of the 1 whole Lemon.
Return the lamb to the pan, placing it on top of the vegetables. Add the remaining 2 whole Fresh Rosemary Sprigs to the liquid. Cover tightly with a lid or foil and transfer to the preheated oven.
Step 4: Slow Roast to Perfection
Roast for 3 to 3½ hours, turning the lamb and basting with the pan juices every 45 minutes. You want the meat to become fork-tender and the internal temperature to reach 195°F for that perfect slow-cooked texture.
The lamb is done when it easily pulls away from the bone. The vegetables should be soft and the liquid should have reduced to a rich, flavorful sauce. If the liquid reduces too much during cooking, add a splash of water to maintain moisture.
Step 5: Rest and Serve
Carefully transfer the lamb to a cutting board and tent loosely with foil. Let it rest for 20 minutes—this allows the juices to redistribute for maximum tenderness. Skim any excess fat from the pan juices if desired, then carve the lamb into thick slices.
Serve the lamb with the pan vegetables and sauce spooned over the top. The meat should be incredibly tender, the sauce rich and aromatic, and the rosemary and garlic flavors should shine through in every bite. This is Sunday roast perfection.
Pro Tips For Making Slow Roast Leg Of Lamb Recipe Jamie Oliver
- Start Hot, Finish Low: I learned this the hard way—sear the lamb at 450°F for 20 minutes first, then drop to 325°F for the slow roast. This locks in the juices while still getting that rosemary-garlic crust Jamie’s recipe is known for.
- Score the Fat Deep: Cut 1-inch slits all over the fat cap before rubbing in the oil, rosemary, and garlic. After burning a few batches, I finally figured out this helps the flavors penetrate and stops the surface from curling.
- Skip the Crowded Pan: Resist the urge to add potatoes or veggies right away—roast the lamb on a rack first, then add them later. Sounds weird, but it works: the lamb cooks evenly and doesn’t steam in its own juices.
- Rest Under Foil: Give it a solid 30 minutes wrapped in foil after roasting. My grandmother swore by this, and she was right: the meat reabsorbs the juices and stays tender, even with the long cook time.
Best Sauces and Condiments for This slow roast leg of lamb recipe jamie oliver
Classic Mint Sauce
You can’t go wrong with a traditional fresh mint sauce—it’s the perfect bright counterpart to rich lamb. I blend 1 cup fresh mint leaves, ¼ cup red wine vinegar, 2 tbsp honey, and a pinch of salt. Let it sit for 30 minutes before serving for the best flavor. 🌿
Garlic-Yogurt Drizzle
For a creamy touch, whisk 1 cup Greek yogurt with 2 minced garlic cloves, 1 tbsp lemon juice, and 1 tbsp olive oil. This cooling sauce balances the lamb’s richness beautifully. I love drizzling it over each slice just before serving.
Red Wine Reduction
Use the pan juices from cooking to create a luxurious sauce. Strain the liquid, then simmer with 1 cup red wine and 1 tbsp butter until reduced by half. The result is a glossy, deeply flavored gravy that’s perfect for spooning over your meal. 🍷
Harissa Paste
Add a North African twist with 2 tbsp harissa paste mixed with 1 tbsp olive oil and 1 tsp lemon juice. This spicy, aromatic condiment cuts through the fat and adds a smoky depth. A little goes a long way with this bold flavor.
Lemon-Herb Chimichurri
Blend 1 cup parsley, ¼ cup cilantro, 3 garlic cloves, ¼ cup olive oil, and the juice of 1 lemon. This vibrant green sauce adds a fresh, herby kick that complements the rosemary and garlic in the lamb perfectly.
Nutrition Facts
Frequently Asked Questions
How long should I let the lamb rest before carving?
Always rest the lamb for 20 minutes after roasting. This allows juices to redistribute throughout the meat, ensuring it stays tender and moist when sliced. Skipping this step can result in dry meat.
Can I use boneless leg of lamb instead?
Yes, but reduce the cooking time by about 30 minutes. Boneless cooks faster and may not hold its shape as well. For best results, tie it with kitchen twine to maintain a uniform shape.
What if my sauce is too thin?
Simmer the pan juices uncovered over medium heat for 5-10 minutes to reduce and thicken. For a richer texture, whisk in 1 tbsp butter at the end. This adds gloss and body to your sauce.
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