Roast Leg of Lamb

Ingredients

• 1 leg, 2–2.5 kgleg of lamb
• 2 tspapplewood smoked salt
• 2 tspground coriander
• 2 tspground cumin
• ½ tspground black pepper
• 1 good handfulfresh rosemary on the stalk
• 2 whole headsgarlic
• 1, halvedlemon
• to tastesalt and pepper

Instructions

1. 1

   Heat the oven

   Preheat the oven to its highest setting.

2. 2

   Season the lamb

   Combine the smoked salt, coriander, cumin and ground black pepper, then rub the mixture all over the leg of lamb.

3. 3

   Prepare the tray

   Slice one head of garlic in half across its width. Put it in the bottom of a large, deep-sided roasting dish with both lemon halves.

4. 4

   Add the rosemary

   Scatter half the rosemary stalks in the dish and set the lamb on top.

5. 5

   Add the aromatics

   Separate the cloves from the second head of garlic and scatter them over and around the lamb with the remaining rosemary.

6. 6

   Cover the tray

   Seal the roasting dish tightly with heavy-duty aluminium foil.

7. 7

   Roast the lamb

   Put the covered dish in the hot oven for 5 minutes. Lower the temperature to 170°C and roast for 4 hours without opening the dish.

8. 8

   Rest the meat

   Take the lamb out of the oven and leave it to rest, still tightly covered, for 20 minutes.

9. 9

   Make the gravy

   Once the lamb is out of the roasting dish, make a quick gravy from the pan juices.

10. 10

    Finish the gravy

    Skim off the fat, mash a few cooked garlic cloves, then heat them with the pan juices and some lamb stock.

What is roast leg of lamb?

Roast leg of lamb is a familiar British centrepiece, often served for a Sunday lunch or a special gathering. This version takes a slow, covered approach rather than aiming for a pink, carved roast.

The spice rub gives the outside a savoury, smoky edge, while garlic, lemon and rosemary flavour the cooking juices. Keeping the tray sealed helps the meat become very tender over the long cooking time.

Nutrition and macros by portion

The nutrition label shows one serving as written: 850 calories, 78g protein, 4g carbs, 57g fat.

Lamb supplies most of the protein and fat, while the garlic and lemon contribute only a small amount of carbohydrate. Serve a moderate portion with plenty of green vegetables and potatoes if you want a more balanced plate.

The spice rub

Dry spices: coriander and cumin bring warm, earthy flavour, while black pepper adds a little bite.

Smoked salt: applewood smoked salt seasons the lamb and contributes a smoky note. Rub the mixture over the whole surface so the seasoning is not concentrated in one area.

Build an aromatic base

Garlic: the halved head sits beneath the lamb, while the loose cloves roast around and on top of it. Some of those softened cloves are mashed into the gravy at the end.

Rosemary and lemon: stalks flavour the meat and pan juices as they roast. The halved lemon adds a bright, savoury note to the tray.

Why the tight cover matters

Foil: seal the dish firmly so steam stays inside during the four-hour roast. A loose cover can let the juices evaporate and the meat dry out.

Hands off: resist lifting the foil while the lamb cooks. The method relies on an even, enclosed stretch of heat after the brief start in the hottest oven.

Check for tenderness

Timing: roast for 5 minutes at the oven's highest setting, then reduce to 170°C and cook for 4 hours. The recipe does not give a separate doneness temperature.

Resting: leave the lamb covered for 20 minutes after roasting. This gives you time to prepare the gravy and lets the meat settle before serving.

Serving the lamb

Carving: serve the lamb with the garlic and rosemary pan gravy, spooned over the meat. Add potatoes and green vegetables for a classic roast-style plate.

Leftovers: pull any remaining meat into pieces for sandwiches, wraps or a simple meal with vegetables. Keep the roasting juices to moisten it when reheating.

Recipe notes & tips

• Use a roasting dish with sides high enough to hold the lamb and juices.
• Press the foil firmly around the dish edges to create a close seal.
• Keep the lamb covered during the full four-hour roast.
• Let the meat rest for the full 20 minutes before serving.
• Taste the pan juices before adding more salt, as the smoked salt has already seasoned the lamb.

Variations

• Fresh herbs: add a few thyme stalks alongside the rosemary.
• Citrus swap: use orange halves instead of lemon for a sweeter aroma.
• Extra warmth: add a pinch of chilli flakes to the spice rub.
• Garlic gravy: mash in more of the soft roasted cloves for a stronger garlic flavour.
• Cumin forward: increase the cumin slightly and reduce the coriander for a deeper earthy note.

Common mistakes to avoid

• Loose foil: steam escapes and the lamb may dry out; crimp the foil tightly around the dish.
• Opening the oven tray: heat and steam escape; leave it sealed for the full four-hour roast.
• Skipping the rest: juices can run out when you carve; rest the lamb covered for 20 minutes.
• Leaving excess fat in the gravy: it can make the sauce greasy; skim the surface before heating the juices.
• Seasoning the gravy too soon: the pan juices may already be salty; taste them before adding extra seasoning.

How to store

Refrigerate leftover lamb and gravy in separate airtight containers for up to 3 days. Reheat until piping hot, adding a little stock or water to the meat if it seems dry.

Frequently asked questions