Slow-Roasted Boneless Leg of Lamb Recipe

Get ready for the most impressive dinner centerpiece you’ve ever created. This slow-roasted leg of lamb achieves the perfect balance – a gorgeously crispy exterior giving way to tender, perfectly pink meat inside. The secret? A flavor-packed herb and anchovy rub that infuses every bite.

This isn’t just any lamb recipe – it’s a masterclass in temperature control and timing that results in meat so tender you can cut it with a fork. The slow roasting method allows the fat to render gradually, while a final high-heat blast creates that coveted crusty exterior that makes everyone fight for the end pieces.

Ingredients

• 2 tablespoons (30ml) extra-virgin olive oil
• 3 medium cloves garlic (15g), minced
• 1 medium shallot (58g), minced
• 6 anchovy filets (11g), minced
• 2 tablespoons (8g) fresh rosemary leaves, finely chopped
• 1 tablespoon (6g) lemon zest, finely grated
• 1/2 teaspoon red pepper flakes
• 2 tablespoons (18g) Diamond Crystal kosher salt
• Freshly ground black pepper
• One 6-8 pound boneless leg of lamb, butterflied

Steps

1. Position rack in lower-third of oven and preheat to 275°F (135°C). Heat 2 tablespoons olive oil in saucepan over medium heat until shimmering (3 minutes). Watch carefully – oil should shimmer but not smoke.
2. Add aromatics (garlic, shallot, anchovies, rosemary, lemon zest, pepper flakes) to oil. Cook for 3-5 minutes until shallots become translucent and garlic softens but doesn’t brown. The anchovies will begin to dissolve – this is perfect.
3. Transfer mixture to bowl and stir in salt and pepper. The mixture should be paste-like. If too dry, add a touch more oil. Divide mixture in half.
4. Butterfly lamb to 1-inch thickness – this ensures even cooking. Spread first half of mixture inside. Roll tightly (like a jelly roll) and secure with twine at 1-inch intervals. Rub exterior with remaining mixture.
5. Place lamb fat-side up on wire rack in foil-lined pan. Roast 2.5-3 hours until thermometer reads 125-130°F (52-54°C) for medium-rare or 130-135°F (54-57°C) for medium. Rest 40 minutes uncovered.
6. Increase oven to 500°F (260°C). Return lamb for 15 minutes until deeply browned and crisp. Rest 5 minutes before removing twine and slicing into 1/4-inch pieces.

Smart Swaps

• Substitute rosemary with 2 tablespoons fresh thyme or 1 tablespoon dried oregano
• Replace anchovies with 1 tablespoon capers, minced, for similar umami

Make It Diabetes-Friendly

• Skip the high-heat finish to reduce AGE formation
• Serve with roasted vegetables instead of starchy sides
• Portion size: stick to 4-ounce servings
• Pair with fiber-rich sides to slow glucose absorption

Pro Tips

• Let lamb come to room temperature before cooking
• Don’t skip the resting periods – they’re crucial for juice redistribution
• Use a sharp knife for clean slices
• Save pan drippings for an incredible gravy