Ready in 2 hours 25 minutes (active prep) + 45 minutes resting . Serves 8-10 . Technique: Reverse Sear and Broiling . Storage: Refrigerate for 4 days.
Roasting a Leg of Lamb is the ultimate centerpiece for a holiday or special gathering. This recipe uses a high-heat sear followed by a low-and-slow roast-a technique that guarantees a savory, crusted exterior and a perfect, rosy-pink interior. The rich flavor of the lamb is perfectly complemented by a bright, zesty, no-cook Parsley-Mint Sauce that cuts through the richness of the meat, making this dish feel sophisticated and light.
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My non-negotiable tip: The long rest time is essential to a juicy roast. After coming out of the oven, the lamb needs to rest for 20 minutes before slicing. If you cut it immediately, all the internal juices will run out onto the board, leaving your expensive meat dry.
Why You'll Love This Recipe
- Perfect Rosy Interior: The two-stage cooking method ensures the meat is evenly pink from edge to edge-the hallmark of a professional roast.
- Crispy, Herbaceous Crust: Starting with a high-heat sear locks in the flavor and builds a beautiful, savory crust.
- Bright, Fresh Sauce: The no-cook Parsley-Mint Sauce is sharp, acidic, and provides the perfect contrast to the rich lamb.
- Frees Up Your Stovetop: This is an oven-based recipe, leaving your stovetop free for all those holiday side dishes.
Ingredients
Here's what you'll need for this impressive holiday roast.
For the Lamb and Rub
- 1 (7- to 8-lb.) bone-in leg of lamb, trimmed and tied.
- 1 ¾ cups olive oil, divided.
- 8 garlic cloves, divided.
- 1 large shallot, roughly chopped.
- 2 Tbsp. finely chopped fresh rosemary.
- 1 tsp. Dijon mustard (essential for the rub's texture and tang).
- 1 Tbsp. black pepper.
- Seasoning: 1 ¾ tsp. kosher salt, divided, ¼ tsp. crushed red pepper, 1 tsp. dried thyme, 1 Tbsp. grated lemon zest.
For the Fresh-Herb Sauce
- 1 cup chopped fresh flat-leaf parsley, plus more for serving.
- 1 cup chopped fresh mint leaves.
- 1 Tbsp. red wine vinegar.
- 2 Tbsp. fresh lemon juice.
- Seasoning: Kosher salt and black pepper.
- Liquid: 1 to 2 tablespoons water (to adjust consistency).
- Garnish: Lemon slices and herbs.
How to Make Roasted Lamb With Fresh-Herb Sauce
Success hinges on time, temperature, and trusting the resting process.
Step 1: Prepare the Lamb and Rub
First, pat the lamb dry. Let it stand at room temperature for 45 minutes to promote even cooking.
In a food processor, pulse the shallot, mustard, red pepper, lemon zest, 3 tablespoons of the lemon juice, 4 of the garlic cloves, and 1 teaspoon each of the salt and black pepper until roughly chopped. With the processor running, gradually add 1 cup of the oil, processing until smooth.
Transfer ½ cup of this mixture to a small bowl (this is the lamb rub), and set the remaining mixture aside (this is the base for the herb sauce).
Cut 1-inch slits all over the lamb. Finely chop the remaining 4 garlic cloves; stir into the reserved ½ cup shallot mixture. Rub this mixture all over the lamb, pressing it into the slits, and sprinkle with the remaining salt and pepper.
Step 2: High-Heat Sear and Low-Roast
Preheat oven to 450°F (230°C) with the rack 8 inches from the heat source. Place a wire rack in a large roasting pan; top with the lamb.
Bake the lamb for 20 minutes at 450°F. This creates the initial, savory crust.
Reduce the oven temperature to 300°F (150°C). Continue to bake until a thermometer inserted into the thickest portion of the lamb registers 130°F (54°C) (about 1 hour 20 minutes to 1 hour 30 minutes).
Step 3: Broil for Crust and Rest
Without removing the lamb from the oven, increase oven temperature to broil. Broil until well browned and the crust has formed, 5 to 10 minutes. (Watch closely to avoid burning.)
Remove the lamb from the oven, and cover loosely with aluminum foil. Let it rest for 20 minutes. (The temperature will continue to rise to 145°F, or medium doneness.)
Step 4: Make Sauce and Slice
While the lamb rests, make the sauce: Add the parsley and mint to the shallot mixture remaining in the food processor. Pulse until the herbs are finely chopped. With the processor running, gradually add the remaining ¾ cup oil and 2 tablespoons lemon juice, and 1 to 2 tablespoons of water until the sauce reaches a pourable consistency.
Thinly slice the rested lamb against the grain, and serve immediately with the fresh Herb Sauce.
Common Mistakes to Avoid
- Slicing Before Resting: If you slice the lamb immediately, all the internal juices will run out onto the board, leaving the meat dry. The 20-minute rest is mandatory.
- Improper Slicing: Always slice the meat against the grain (perpendicular to the muscle fibers). Slicing with the grain will make even the most tender lamb tough and stringy.
- No Thermometer: Do not guess the temperature of lamb. Using an instant-read digital thermometer is the only way to ensure the meat is not overcooked past medium-rare.
Tips and Tricks for Success
- The Two-Temp Method: Starting the roast at 450°F provides an immediate, intense sear that builds the dark, savory crust. Dropping the temperature allows the meat to finish gently.
- The Wire Rack: Roasting the lamb on a wire rack allows the hot air to circulate 360 degrees, helping the fat render and ensuring a crust forms on all sides.
- Pat it Dry: Patting the lamb dry before seasoning and roasting is essential for a good crust. Moisture creates steam, which prevents browning.
- Sauce Consistency: Adjust the water in the sauce until it is thick enough to coat a spoon but thin enough to drizzle.
Variations
- Add Umami: Add 2-3 anchovy fillets (finely chopped) to the shallot-garlic rub for a deep, savory flavour.
- Different Herbs: Substitute the thyme and rosemary with fresh oregano or a teaspoon of smoked paprika in the rub.
- Creamy Sauce: Swap the olive oil in the sauce for a mix of olive oil and mayonnaise or sour cream for a creamier texture.
How to Serve
This Roasted Lamb is an elegant centerpiece for any holiday meal.
- Serve the sliced lamb with a generous spooning of the Lemony Herb Sauce.
- Pair with Ultra-Fluffy Mashed Potatoes or creamy polenta.
- It's a stunning main course for Christmas or Easter dinner.
Make Ahead and Storage
- Make Ahead (Prep): The lamb can be fully rubbed and tied (Steps 1-2) up to 24 hours in advance. Store it, uncovered, in the refrigerator.
- Make Ahead (Sauce): The Herb Sauce can be made up to 1 day in advance. Store it in an airtight container in the fridge (let it come to room temperature and stir before serving).
- Storage: Store leftovers, tightly wrapped, in the refrigerator for up to 4 days.
- Reheating: Reheat slices gently in a 325°F (160°C) oven, covered in foil, until warmed through.
Recipe Notes What I Learned
The subtle science of this recipe is the two-temperature method. By using the high-heat blast first, you get that deep, beautiful crust immediately. The long rest period is a non-negotiable step that allows the internal temperature to equalize and the beef to retain its tenderness, resulting in a juicy, perfect slice.
Nutrition Snapshot
Estimated Nutrition Per Serving (⅛th of recipe, with sauce): 610 calories .58g protein .4g carbs . 40g fat
Roasted Lamb With Fresh-Herb Sauce
Equipment
- Large roasting pan with wire rack
- Food processor
- Small bowl
- Meat thermometer
- Aluminum foil
Ingredients
Group: Lamb & Rub
- 1 (7- to 8-lb.) bone-in leg of lamb, trimmed and tied
- 1 large shallot, roughly chopped (about ½ cup)
- 1 tsp. Dijon mustard
- ¼ tsp. crushed red pepper
- 1 Tbsp. grated lemon zest
- 5 Tbsp. fresh lemon juice, divided (from 2 lemons)
- 8 garlic cloves, divided
- 1 ¾ tsp. kosher salt, divided
- 1 ¾ tsp. black pepper, divided
- 1 ¾ cups olive oil, divided
Group: Herb Sauce
- 1 cup chopped fresh parsley plus more for garnish
- 1 cup chopped fresh mint plus more for garnish
- Lemon slices to serve
Instructions
- Preheat oven to 450°F with rack 8 inches from heat source. Place a wire rack in a large roasting pan; top with lamb, and pat dry. Let stand at room temperature for 45 minutes.
- Meanwhile, pulse shallot, mustard, red pepper, lemon zest, 3 tablespoons of the lemon juice, 4 of the garlic cloves, and 1 teaspoon each of the salt and black pepper in a food processor until roughly chopped, about 10 pulses.
- With processor running, gradually add 1 cup of the oil, processing until smooth. Transfer ½ cup of the shallot mixture to a small bowl, and set aside. Cover remaining shallot mixture in food processor bowl, and set aside.
- Cut 1-inch slits all over lamb. Finely chop remaining 4 garlic cloves; stir into reserved ½ cup shallot mixture. Rub shallot-garlic mixture over lamb, and sprinkle with remaining ¾ teaspoon each salt and pepper.
- Bake lamb in preheated oven for 20 minutes. Reduce the oven temperature to 300°F, and bake until a thermometer inserted into thickest portion of lamb registers 130°F, 1 hour and 20 minutes to 1 hour and 30 minutes.
- Without removing lamb from oven, increase oven temperature to broil, and broil until well browned, 5 to 10 minutes. Remove lamb from oven, and cover loosely with aluminum foil. Let rest 20 minutes. (Temperature will continue to rise to 145°F.)
- While lamb rests, add parsley and mint to shallot mixture in food processor; pulse until herbs are finely chopped and incorporated, about 20 pulses. With machine running, gradually add remaining ¾ cup oil and 2 tablespoons lemon juice, processing until incorporated. With processor running, gradually add 1 to 2 tablespoons water until sauce reaches desired consistency.
- Thinly slice lamb against the grain, discarding bone or reserving for another use. Serve sliced lamb with herb sauce. Garnish with lemon slices and herbs.
Notes
Nutrition
FAQs
Why is the target temperature so low (130°F)?
130°F is the temperature to pull the roast from the oven. This is necessary because the meat will continue to cook as it rests, and the temperature will coast up to the final safe serving temperature of 135°F-140°F (Medium-Rare).
Do I have to tie the roast?
Tying the roast is important because it ensures the meat is uniform in shape and prevents the meat from separating during cooking, promoting even cooking throughout the cut.
Can I use a boneless leg of lamb?
Yes, but a boneless, rolled leg of lamb will cook much faster. Start checking the internal temperature at the 1-hour mark.
