There is something deeply satisfying about pulling a slow roasted leg or shoulder of lamb from the oven, knowing it has been quietly transforming for hours into something extraordinary. Mary Berry’s slow roasted lamb recipe is everything a Sunday roast should be: tender, juicy, deeply flavoured, and surprisingly simple to prepare. Whether you are cooking for Easter, a family gathering, or a relaxed weekend lunch, this recipe never lets you down.
The magic here is time. Low and slow is the method, and the result is melt-in-the-mouth lamb that practically falls off the bone. Infused with garlic and fresh rosemary, finished with a rich red wine gravy made from the pan drippings, this dish is a true British classic that earns a permanent place in your recipe collection.
Ingredients
For the Lamb
- 2 kg bone-in lamb shoulder or leg of lamb
- 4 to 5 garlic cloves, thinly sliced
- 2 tablespoons fresh rosemary leaves, chopped
- 2 tablespoons olive oil
- 1 teaspoon smoked paprika
- 1 teaspoon dried thyme
- Salt and freshly ground black pepper
- Juice of half a lemon
For the Roasting Base
- 2 medium onions, cut into wedges
- 2 medium carrots, roughly chopped
- 4 garlic cloves, halved
- 150 ml white wine or lamb stock
- 2 fresh rosemary sprigs
- 1 tablespoon olive oil
For the Gravy
- 3 tablespoons lamb fat skimmed from the roasting juices
- 2 tablespoons plain flour
- 450 ml hot lamb or beef stock
- 100 ml red wine
- 1 tablespoon redcurrant jelly
- 1 teaspoon Worcestershire sauce
- Salt and pepper to taste
How to Make Mary Berry Slow Roasted Lamb
Follow these steps for foolproof, fall-apart slow roasted lamb every time.
- Preheat the oven to 220°C (200°C fan / Gas Mark 7). Remove the lamb from the fridge at least 30 to 45 minutes before cooking to bring it to room temperature.
- Score and stuff the lamb. Using a small sharp knife, make 10 to 12 deep incisions all over the joint. Push a slice of garlic and a small pinch of rosemary into each hole. This infuses the meat with flavour from the inside out.
- Make the herb rub. In a small bowl, mix together olive oil, smoked paprika, thyme, lemon juice, salt, and pepper. Rub this mixture generously all over the surface of the lamb, pressing it well into any crevices.
- Brown the lamb. Place the lamb in a large flameproof roasting tin and roast in the hot oven for 20 minutes until the top is golden brown. Turn the joint and roast for another 15 to 20 minutes to colour all sides. This step builds a rich, savoury crust and develops deep flavour.
- Prepare the roasting base. Remove the lamb from the tin. Add the onion wedges, carrots, halved garlic cloves, and rosemary sprigs. Drizzle with olive oil and toss briefly. Pour the white wine or stock into the tin, scraping up any caramelised bits from the bottom.
- Slow roast the lamb. Return the browned lamb to the tin, placing it on top of the vegetables. Cover tightly with a double layer of foil, sealing the edges well. Reduce the oven temperature to 160°C (140°C fan / Gas Mark 3). Roast for 4 to 4.5 hours until the meat is completely tender and pulls apart easily with a fork.
- Rest the lamb. Transfer the lamb to a warm serving platter, cover loosely with foil, and rest for at least 20 to 30 minutes before serving.
- Make the gravy. Strain the juices from the roasting tin into a jug. Skim off most of the fat, reserving 3 tablespoons. Heat the reserved fat in a saucepan over medium heat, stir in the flour, and cook for 30 seconds. Gradually whisk in the hot stock and red wine, followed by the strained roasting juices, redcurrant jelly, and Worcestershire sauce. Simmer for 5 to 8 minutes until thickened. Season to taste.
- Serve by pulling apart the lamb at the table or shredding it with two forks. Spoon the glossy gravy generously over the top.
Tips for the Best Slow Roasted Lamb
How do I keep the lamb tender?
The key is low oven heat, a tight foil seal, and adequate time. The foil traps steam, keeping the moisture circulating around the meat so it never dries out. Aim for an internal temperature of around 90°C (195°F) for truly fall-apart results.
Should I baste the lamb during cooking?
Basting every hour helps, but it is not strictly necessary if your foil seal is tight. If you do lift the foil to baste, reseal it quickly to retain the heat and steam inside the tin.
What cut of lamb works best?
Lamb shoulder is the ideal cut for slow roasting because it contains more connective tissue and fat, which breaks down beautifully over long cooking. A bone-in shoulder adds even more flavour. A leg of lamb also works well and produces leaner, slightly firmer slices.
Why is resting the lamb important?
Resting allows the muscle fibres to relax and the juices to redistribute evenly through the meat. Skip this step and those precious juices will run straight onto the board when you carve. A 20 to 30 minute rest under loose foil is well worth the patience.
Serving Suggestions
Mary Berry’s slow roasted lamb pairs beautifully with a range of classic British sides. Here are some winning combinations to complete your roast:
- Crispy roast potatoes cooked in goose fat or olive oil for a golden, crunchy finish
- Creamy mashed potatoes to soak up the rich red wine gravy
- Minted peas or buttered green beans for a fresh, vibrant contrast
- Honey-glazed roasted carrots and parsnips for natural sweetness
- Yorkshire puddings for a proper Sunday roast experience
- Mint sauce or redcurrant jelly on the side for a classic British touch
- Crusty bread to mop up every last drop of gravy
For a French-inspired twist, as seen in Mary Berry’s BBC series Simple Comforts, serve the lamb on a bed of slow-cooked ratatouille-style vegetables for a one-pan feast.
Storage
Room Temperature
Do not leave cooked lamb at room temperature for more than two hours. Bacteria multiply rapidly between 4°C and 60°C, so move leftovers into the fridge or freezer promptly.
Refrigerator
Store leftover lamb in an airtight container in the refrigerator for up to 3 days. Shred the meat before storing to make reheating quicker and easier. To reheat, warm gently in a low oven covered with foil, or in a pan with a splash of stock to keep the meat moist. Avoid the microwave for larger portions as it can dry the lamb out unevenly.
Freezing
Slow roasted lamb freezes exceptionally well. Shred the cooled meat and store in freezer-safe bags or containers for up to 3 months. Freeze the gravy separately. Defrost overnight in the fridge and reheat gently with a little added stock to restore moisture and freshness.
Nutrition
The following values are approximate per serving (based on 6 servings, lamb shoulder with gravy):
| Nutrient | Per Serving |
| Calories | 480 kcal |
| Protein | 42 g |
| Fat | 28 g |
| Saturated Fat | 11 g |
| Carbohydrates | 8 g |
| Fibre | 1 g |
| Sodium | 520 mg |
Values will vary depending on the exact cut of lamb, trimming of fat, and portion size. Sides and potatoes are not included in these figures.
FAQ’s
How long does it take to slow roast a leg of lamb?
For a 2 kg bone-in joint at 160°C, allow approximately 4 to 4.5 hours covered with foil after the initial browning stage.
Can I prepare the lamb the night before?
Yes. Score, stuff with garlic and rosemary, rub with the herb paste, and refrigerate overnight. Remove from the fridge 30 to 45 minutes before cooking.
What temperature should slow roasted lamb reach?
For fall-apart pulled lamb, aim for an internal temperature of 90°C (195°F). For sliceable but still tender lamb, 75 to 80°C is sufficient.
Can I cook this without wine?
Absolutely. Swap the white wine for extra lamb or vegetable stock. For the gravy, replace red wine with additional beef stock and an extra teaspoon of redcurrant jelly.
Why did my lamb turn out dry?
The most common cause is an inadequate foil seal. Make sure the foil is pressed tightly against the edges of the roasting tin so no steam escapes during the slow cook.
Can I use a slow cooker instead?
Yes. After browning, transfer everything to a slow cooker and cook on low for 8 to 10 hours. Finish under a hot grill for 5 minutes to restore the crust before serving.
What herbs work best with slow roasted lamb?
Rosemary is the classic choice, but thyme, oregano, and fresh mint all complement lamb beautifully. Using a combination of two or three herbs adds complexity to the flavour.
Conclusion
Mary Berry’s slow roasted lamb recipe is the kind of dish that earns genuine compliments and requests for seconds. The combination of initial high-heat browning, a deep garlic and rosemary rub, and four patient hours in a low oven produces lamb that is genuinely exceptional. The rich red wine and redcurrant gravy ties everything together into a meal that feels both elegant and comfortingly homemade.
This is not a complicated recipe, but it does reward attention to a few key details: a tight foil seal, bringing the meat to room temperature, and that all-important resting time. Get those right, and you will have a slow roasted lamb that rivals anything from a restaurant kitchen. Make it once, and it will become your go-to roast for every special occasion.
