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Grilled Leg of Lamb with Thyme and Allspice

This grilled leg of lamb with thyme and allspice is a sophisticated yet simple way to enjoy a classic roast with a modern, aromatic twist. By marinating the meat for twelve hours, the flavours of citrus, garlic, and earthy herbs penetrate deep into the lamb, ensuring every slice is succulent and fragrant. The slow, indirect heat of the grill creates a beautiful crust while keeping the centre perfectly pink and tender.

As a diabetes-friendly main course, this dish focuses on high-quality lean protein and heart-healthy olive oil, making it a nutritious choice for a weekend gathering or a festive celebration. Serve this homemade favourite with a side of steamed seasonal greens or a crisp garden salad for a balanced, low-carbohydrate meal that feels truly indulgent.

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Ingredients for Grilled Leg of Lamb with Thyme and Allspice

  • 4 large garlic cloves

  • 1 1/2 teaspoons salt

  • 2 tablespoons olive oil

  • 1 teaspoon finely grated fresh lemon zest

  • 1 tablespoon fresh lemon juice

  • 5 teaspoons minced fresh thyme

  • 1 teaspoon black pepper

  • 1/2 teaspoons ground allspice

  • 1 (6 1/2- to 7-lb) bone-in leg of lamb, trimmed of all but a thin layer of fat

  • an instant-read thermometer

How to make Grilled Leg of Lamb with Thyme and Allspice

Mince garlic, then mash to a paste with salt. Stir together garlic paste, oil, lemon zest and juice, thyme, pepper, and allspice. Put lamb, fat side up, in a large ceramic or glass dish. Using a paring knife, make 1 1/2-inch-long slits (about 2 inches deep) 2 inches apart all over leg. Reserve 1 teaspoon thyme mixture and push remainder into slits, then rub all over with reserved teaspoon of mixture. Marinate lamb, covered and chilled, 12 hours.

Let lamb stand at room temperature 30 minutes before grilling.

Prepare grill for indirect-heat cooking over medium-hot charcoal (high heat for gas). If using a gas grill, preheat all burners on high, covered, 10 minutes, then turn off all burners except burner closest to you.

Oil grill rack, then grill lamb over area with no coals (or over turned-off burner or burners), covered, without turning, until thermometer inserted into thickest part of roast (almost to the bone but not touching it) registers 52°C for medium-rare, 1 1/4 to 1 1/2 hours (temperatures in thinner parts of leg may register up to 71°C). To maintain medium-hot charcoal, add more charcoal (about 475ml ) every 15 minutes.

Let lamb stand on a cutting board, uncovered, 30 minutes.

Disclaimer

While every effort has been made to ensure the information is accurate and up to date, individual needs may vary and dietary requirements can differ based on personal health conditions. Always check food labels and allergen information before preparing or consuming any recipe. If you have specific health concerns, allergies, intolerances, or are following a medically prescribed diet, seek advice from your GP, pharmacist, or a registered dietitian before making significant changes to your diet or lifestyle.

Article history

The information on this page is peer reviewed by qualified clinicians.

  • 17 Jan 2026 | Originally published

    Authored by:

    UK recipe editors

    Peer reviewed by

    UK recipe editors
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