Name: Mary Berry Harissa Lamb Recipe
Prep time: 20 min
Cook time: 2 h 45 min
Total time: 4 h 30 min
Ingredients: 1.5kg bone-in leg of lamb; 3 tbsp rose harissa paste; 2 tbsp olive oil; 4 garlic cloves, finely sliced; 1 lemon, zested and halved; 1 tsp ground cumin; 1 tsp smoked paprika; 1 tsp sea salt; half tsp freshly ground black pepper; 2 medium white onions, thickly sliced; 1 tin (400g) chopped tomatoes; 150ml lamb or chicken stock; 1 cinnamon stick; 3 sprigs fresh rosemary; 2 bay leaves; small bunch fresh flat-leaf parsley, roughly chopped; 2 tbsp pomegranate seeds (optional); 1 lemon, cut into wedges; 100g Greek yogurt, to serve

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This harissa lamb is a deeply savoury, slow-roasted dish with a burnished, rust-red crust that gives way to tender, pull-apart meat underneath. The harissa paste clings to the surface of the lamb during cooking, forming a lightly charred, aromatic coating that carries warmth from dried chillies, earthy cumin, and the bright note of lemon, while the meat itself stays moist and richly flavoured all the way to the bone.

What makes this version particularly reliable is the marinade time and the low, steady oven temperature. It suits a relaxed weekend gathering or a simple Sunday lunch equally well, and most of the work is done ahead of time, leaving very little to do once guests arrive. From start to finish, including marinating, it is ready in around 4 hours and 30 minutes.

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Ingredients

For The Lamb

1.5kg bone-in leg of lamb
3 tbsp rose harissa paste
2 tbsp olive oil
4 garlic cloves, finely sliced
1 lemon, zested and halved
1 tsp ground cumin
1 tsp smoked paprika
1 tsp sea salt
Half tsp freshly ground black pepper

For The Roasting Tray

2 medium white onions, thickly sliced
1 tin (400g) chopped tomatoes
150ml lamb or chicken stock
1 cinnamon stick
3 sprigs fresh rosemary
2 bay leaves

To Finish

Small bunch fresh flat-leaf parsley, roughly chopped
2 tbsp pomegranate seeds (optional)
1 lemon, cut into wedges
100g Greek yogurt, to serve

How to Make Mary Berry Harissa Lamb Recipe

Prepare the lamb:

Using a small sharp knife, score the surface of the lamb leg all over, making cuts roughly 2cm deep and spaced about 3cm apart. Push a slice of garlic into each cut. This allows the harissa marinade to penetrate beyond the surface and infuses the meat with garlic as it roasts slowly.

Make the marinade:

In a small bowl, mix together the harissa paste, olive oil, lemon zest, ground cumin, smoked paprika, salt, and black pepper until combined into a thick, rust-coloured paste. Squeeze one lemon half over the mixture and stir again.

Coat and marinate the lamb:

Rub the harissa paste all over the surface of the lamb, pressing it into the scored cuts and covering the underside as well. Place the lamb on a large plate, cover tightly with cling film, and refrigerate for at least 2 hours, or overnight for the deepest flavour. Bring the lamb out of the fridge 30 minutes before cooking so it reaches room temperature evenly.

Preheat and prepare the tray:

Preheat the oven to 170°C fan (190°C conventional, gas mark 5). Scatter the sliced onions across the base of a deep roasting tray, then pour over the chopped tomatoes and stock. Add the cinnamon stick, rosemary sprigs, and bay leaves. This fragrant base will keep the lamb moist and create a richly flavoured sauce in the bottom of the tray during cooking.

Roast the lamb:

Sit the marinated lamb on top of the onion and tomato mixture in the roasting tray. Squeeze the remaining lemon half over the top. Cover the tray tightly with two layers of foil and place on the middle shelf of the preheated oven. Roast for 2 hours covered, then remove the foil and return to the oven for a further 30 to 45 minutes until the surface is deeply coloured and caramelised.

Rest and serve:

Remove the lamb from the oven and loosely tent with foil. Leave to rest for 20 minutes before serving. Resting allows the juices to redistribute through the meat, so that every piece remains succulent when pulled apart. Scatter with chopped parsley and pomegranate seeds if using, and serve with lemon wedges and a spoonful of Greek yogurt alongside.

Tips for the Best Mary Berry Harissa Lamb

01 Why is my lamb still tough after the cooking time listed? +−

The foil seal is the most common cause. If steam escapes during the covered stage, the lamb braising liquid reduces too quickly and the meat dries rather than braises. Check the foil is pressed firmly around all four edges of the tray before putting it in the oven.

02 Why does the harissa crust burn before the lamb is cooked through? +−

This usually means the oven temperature is slightly too high, or the foil was removed too early. Keep the lamb covered for the full two hours and only uncover it for the final 30 to 45 minutes. If the crust colours very quickly once uncovered, loosely lay a sheet of foil over the top without pressing it down.

03 How do I know when the lamb is ready to pull apart? +−

Insert a fork near the thickest part of the meat and twist gently. If the meat separates with little resistance and falls away from the bone cleanly, it is ready. A meat thermometer inserted away from the bone should read at least 90°C for pull-apart consistency.

04 Why is there too much liquid in the roasting tray at the end? +−

Pour the liquid from the tray into a small saucepan and simmer briskly over a medium heat for 8 to 10 minutes until it reduces to a thicker, sauce-like consistency. Remove the cinnamon stick and bay leaves, then spoon it over the lamb before serving.

05 My lamb has dried out on the outside but the inside is still pink. What went wrong? +−

The oven temperature was too high for the covered stage. At 170°C fan, the lamb should cook gently and evenly. If your oven runs hot, reduce to 160°C fan for the covered stage and add an extra 20 minutes before removing the foil. Re-cover with foil and return to the oven if the outside is drying before the inside is cooked through.

Serving Suggestions

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Serve with warm flatbreads or pitta to scoop up the lamb and spoon through the braised tomato sauce from the tray.

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Pair with a simple cucumber and mint yogurt, made by stirring finely diced cucumber and torn mint leaves through plain Greek yogurt, for a cooling contrast to the heat of the harissa.

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Spoon over couscous or bulgur wheat that has been fluffed with a little butter and a pinch of cinnamon, which picks up the warm spice notes in the braising liquid.

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Pile onto a large sharing board with roasted aubergine wedges, sliced radishes, and a scattering of pomegranate seeds for a relaxed centrepiece at a casual dinner party.

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Add a side of crispy roasted chickpeas seasoned with smoked paprika and sea salt to bring a welcome textural contrast alongside the soft, yielding meat.

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Storage

Up To 2 Days

Room Temperature

Store leftover lamb in an airtight container at room temperature for no longer than 2 hours after serving before transferring to the fridge.

Up To 3 Days

Refrigerator

Transfer the pulled lamb along with any braising juices into an airtight container and refrigerate for up to 3 days. Bring the lamb to room temperature for 20 minutes before reheating gently in a covered dish at 160°C fan with a splash of stock or water to prevent it drying out.

Up To 3 Months

Freezing

Portion the cooled lamb into freezer-safe bags or containers along with some of the braising sauce, removing as much air as possible before sealing, and freeze for up to 3 months. Defrost overnight in the fridge and reheat covered in the oven at 160°C fan until piping hot throughout.

Nutrition

Calories

420

kcal per serving

Carbohydrates

38g

Protein

26g

Fat

10g

Saturated Fat

520mg

Sodium

Nutrition values are estimates based on a single serving from a recipe that serves 4 to 5 people. Actual values may vary depending on the specific brand of harissa, the cut of lamb, and any accompaniments used.

FAQs

01 Can I use boneless lamb shoulder instead of a leg for this recipe? +−

Boneless lamb shoulder works very well here and is actually slightly more forgiving than the leg because of its higher fat content. Reduce the cooking time slightly by about 20 minutes as a boned joint cooks through faster, and keep a close eye on the texture when you remove the foil.

02 Can I make this Mary Berry harissa lamb recipe ahead of time? +−

The lamb can be fully cooked a day in advance and kept in the fridge with all of the braising juices. Reheat covered in a deep dish at 160°C fan for 25 to 30 minutes until thoroughly warmed through. The flavour actually deepens overnight, making this a smart choice for entertaining.

03 Can I use mild harissa if I do not want too much heat? +−

Rose harissa is the best choice for a balanced, fragrant warmth rather than sharp heat. If you prefer a milder result, look for a harissa paste labelled mild or reduce the quantity to 2 tablespoons and add an extra teaspoon of smoked paprika to keep the depth of flavour without the chilli intensity.

04 Can I cook this harissa lamb in a slow cooker instead of the oven? +−

Yes. Place the marinated lamb on top of the onion and tomato mixture in the slow cooker bowl and cook on low for 8 to 9 hours. The crust will not caramelise in a slow cooker, so transfer the lamb to a baking tray and place under a medium grill for 6 to 8 minutes after slow cooking to colour the surface before serving.

05 Can I double this recipe to feed a larger group? +−

You can roast two legs of lamb in separate trays rather than trying to fit them into one, as overcrowding prevents even cooking. Keep the oven temperature and timings the same, but rotate the trays halfway through the covered cooking time if your oven has any hot spots.

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Conclusion

This Mary Berry harissa lamb recipe delivers everything a slow-roasted centrepiece should: a deeply coloured, spiced crust, tender meat that pulls apart without effort, and a richly flavoured braising sauce that requires no extra work to produce. The marinade does the heavy lifting well in advance, so the actual time spent at the stove is minimal. Made with a 1.5kg bone-in leg of lamb, this recipe serves 4 to 5 people comfortably.

Whether it is on the table for a relaxed Sunday lunch or the centrepiece at a casual dinner with friends, this dish holds its own without any fuss. If you make it, leave a comment below to share how it turned out, and do not forget to save or share the recipe with someone who would enjoy it. For another comforting bake to round off the meal, take a look at the Mary Berry chocolate eclairs recipe, which makes a lovely showstopping dessert to follow.