There is a moment at every good feast when the main dish comes to the table and the room goes quiet. A whole roast leg of lamb does that better than almost anything. It is generous, it looks magnificent, and unlike turkey it is very hard to make dry. Roast lamb makes a centrepiece for a festive table, an Eid gathering or simply a proper Sunday roast.
This guide covers everything you need for the festive table this winter: choosing the right leg, a timings table you can trust, how to tell when it is done the way you like it, and two ways to cook it. The first is the British roast with garlic and rosemary. The second is raan, the slow-roasted, spice-marinated leg that has been the centrepiece of South Asian celebrations for centuries.
A bone-in leg is the classic. The bone carries heat into the centre of the joint, adds flavour and keeps the meat moist, and it looks the part on the table. It is a little harder to carve, but only a little. THB's whole leg of lamb weighs around 2.5kg and feeds six to eight.
A boneless leg cooks more evenly and quickly, carves in neat slices, and can be opened out and stuffed before rolling and tying. It is the better choice if you are less confident with carving or want to stuff it. THB's boneless lamb leg is ideal for this.
For a smaller gathering, a lamb leg portion roasts the same way in less time.
Allow 350g to 400g of bone-in leg per adult, or 250g to 300g of boneless. A 2.5kg leg comfortably feeds six to eight with all the trimmings.
Leg is a lean joint, and it is at its best served pink and juicy. Meat that has been frozen and thawed loses moisture before it reaches the oven and comes out drier. THB lamb is butchered fresh, never frozen, and delivered chilled within 24 hours, so you can cook it the day it arrives or the day after.
This is a simple recipe, and every step earns its place.
Take the lamb out of the fridge an hour or two before cooking so it is not cold in the centre. Pat it dry.
With a small sharp knife, make 15 to 20 small, deep incisions all over the meat. Push a sliver of garlic and a small piece of fresh rosemary into each one. You will need about 6 garlic cloves and 3 or 4 rosemary sprigs.
Mix 3 tablespoons of olive oil with the lemon zest and juice of a lemon, 2 teaspoons of sea salt, a teaspoon of black pepper and a little chopped thyme to make a loose paste. Season generously, rubbing it all over the lamb.
Preheat the oven to 220°C (200°C fan). Sit the lamb on a bed of 2 thickly sliced onions, a few more garlic cloves and some rosemary in a roasting tin, and pour in 250ml of stock or water.
Roast at the high temperature for 20 minutes to brown the outside. Then reduce the oven to 180°C (160°C fan) and roast for the time in the table below.
Use this guide based on weight. After the initial 20 minutes at 220°C (200°C fan), at 180°C (160°C fan):
| Doneness | Time per 500g (bone in) | 2.5kg bone-in leg | Internal temperature (take out at) |
|---|---|---|---|
| Pink (medium rare) | 15 minutes | 1 hour 15 minutes | 55°C to 58°C |
| Medium | 20 minutes | 1 hour 40 minutes | 60°C to 63°C |
| Well done | 25 to 30 minutes | 2 hours 5 minutes to 2 hours 30 minutes | 70°C plus |
For a boneless leg, reduce the times by about a fifth and start checking early.
These are guides. Ovens vary and so do legs, so use a meat thermometer: it is the most reliable tool you can own. Push it into the thickest part of the meat, not touching the bone. Take the lamb out a few degrees below your target; it will keep rising as it rests.
Lift the lamb onto a warm board, loosely cover with foil and give it a resting time of at least 20 minutes, ideally 30. This is not optional. Resting lets the juices settle back into the meat while the residual heat finishes the cooking, and lamb carved too soon loses its juices all over the board.
While the lamb rests, spoon most of the fat from the roasting tin and put it on the hob. Stir a tablespoon of flour into the meat juices and onions, cook for a minute, then whisk in 400ml of hot stock. Simmer for 5 minutes, strain, and add a teaspoon of mint sauce or redcurrant jelly if you like it a little sweet.
Hold the shank end with a cloth. Carve slices from the meatiest side at a slight angle, cutting down to the bone, then run the knife along the bone to release them. Turn the leg over and repeat on the other side. Do not worry about perfect slices; generous, slightly rustic pieces look better on a festive platter anyway.
Once the lamb comes out to rest, turn the oven up to 220°C (200°C fan) and give your roast potatoes their final 30 minutes. Spoon a little of the lamb fat from the tin over them for extra flavour. By the time the lamb is carved, the potatoes are ready.
Raan is the grand celebration dish of Mughal kitchens: a whole leg of lamb marinated for a day in yoghurt and spices, then roasted slowly until the meat falls from the bone. Where the British roast is about pink, tender slices, raan is about deep spice and meat you can pull apart with a fork. It is a superb choice for Eid, a wedding gathering, or a festive table where some guests want something more exciting than turkey.
Make deep slashes all over a 2.5kg bone-in leg, cutting right down to the bone. Rub in the juice of 2 lemons and 2 teaspoons of salt, and leave for 30 minutes.
In a food processor, blend together 300g of thick yoghurt, a thumb of ginger, 8 garlic cloves, 3 green chillies, 2 tablespoons of ground almonds, 2 teaspoons of Kashmiri chilli powder, 2 teaspoons of garam masala, 1 teaspoon each of ground cumin and coriander, half a teaspoon of turmeric, a pinch of saffron soaked in a tablespoon of warm water, 3 tablespoons of oil and a handful of fried onions.
Massage the marinade deep into every slash. Cover and refrigerate for at least 12 hours, ideally 24.
Let the lamb come to room temperature for an hour. Preheat the oven to 160°C (140°C fan). Put the leg in a deep roasting tin with 200ml of water, cover tightly with a double layer of foil, and roast for 4 hours, basting once or twice with the juices. Slow cooking under foil is what makes raan so tender.
Uncover, turn the oven up to 200°C (180°C fan), and roast for a final 20 to 30 minutes to char and caramelise the outside. The meat should be completely tender and pulling away from the bone.
Rest for 20 minutes. Scatter with fresh coriander, fresh mint, sliced red onion, pomegranate seeds and a handful of toasted almonds. Serve with naan, a mint and yoghurt chutney and a crisp salad, or alongside a pilau.
A roast leg of lamb works as the only centrepiece, or alongside a turkey for larger families who want a choice. If turkey is on your menu too, THB's guide to halal turkey for Christmas covers sizes, roasting times and pre-orders. Lamb has the practical advantage of needing far less oven time than a big bird, so the two can be timed to finish together.
If you are feeding a crowd over the holidays, THB's Roasting Box and Lamb Royale Box bring together several joints in one delivery. For a slower, more forgiving roast, the guide to cooking lamb shoulder is worth reading, and THB Mag's dinner party guide helps with planning and timings.
Cold roast lamb is one of the great pleasures of the days after a feast. Slice it thinly into sandwiches with mint jelly or mango chutney. Shred leftover raan into wraps with salad and yoghurt. Or chop it and turn it into a quick lamb biryani or a shepherd's pie.
Cooked lamb keeps for three days in the fridge, well wrapped, and freezes for up to three months.
For a 2.5kg bone-in leg, 20 minutes at 220°C (200°C fan), then about 1 hour 40 minutes at 180°C (160°C fan) for medium. Allow 15 minutes per 500g for pink and 25 to 30 minutes for well done.
Take it out of the oven at 55°C to 58°C for pink, 60°C to 63°C for medium, or 70°C plus for well done. It will rise a few degrees as it rests.
Not for a classic pink roast; you want the outside to brown. For a slow-cooked raan, cover tightly with foil for most of the cooking, then uncover to finish.
Leg is leaner and best served pink in slices. Shoulder is fattier and best slow-roasted until it pulls apart. Both are excellent; they just suit different meals.
For a garlic and rosemary roast, up to a day ahead. For raan, 12 to 24 hours is ideal; much longer and the yoghurt can start to make the surface texture soft.
A 2.5kg to 3kg bone-in leg, or about 2kg boneless.
Yes. All THB lamb is certified halal, hand-slaughtered in accordance with Islamic principles, and delivered fresh, never frozen.
Whether it is a pink British roast or a raan that has been marinating since yesterday, a perfect roast leg of lamb turns any gathering into an occasion. Order a fresh halal leg of lamb or boneless leg from THB today, delivered chilled tomorrow, and explore the full lamb range for the rest of the festive table.
Updated October 2026.
