Why Shoulder Is the Cut Worth Knowing

Lamb shoulder does something a leg of lamb simply cannot: it falls apart. All that fat and connective tissue melts down over a long, low cook until the meat gives way at the press of a spoon, and the juices left in the tin are worth more than most gravies you'll ever make from a packet. It is also one of the cheapest joints on the counter, often a good deal less per kilo than leg, and it feeds more people. That combination of cheap and forgiving makes it the roast I recommend to anyone who finds the idea of cooking a joint slightly nerve-wracking.

This is a Sunday sort of dish, but it asks very little of you. An hour of gentle prep on a Saturday morning, or even a Tuesday evening, and the oven does the rest while you get on with something else.

Choosing and Prepping the Joint

Aim for a bone-in shoulder weighing around 2kg, which will feed four generously on the day with enough left over for the following night's supper. Bone-in cooks better — the bone conducts heat into the middle of the meat and gives you a clear signal when it's ready. Ask your butcher to score the fat in a close diamond pattern; it helps the fat render and gives you somewhere to push the garlic.

Take the joint out of the fridge a good hour before it goes in the oven. Cold meat cooks unevenly, and the outside will dry out before the centre has had a chance to relax.

• 4–6 garlic cloves, peeled and cut into thin slivers
• 3–4 sprigs of rosemary, leaves stripped and roughly chopped
• 2 anchovy fillets, optional but worth trying — they dissolve into the sauce and deepen the flavour
• 1 lemon, halved
• 2 tbsp olive oil, plus a little for the tin
• 2 onions, thickly sliced, to sit the lamb on
• Salt and plenty of black pepper

Stab the joint all over with the tip of a sharp knife, then push a garlic sliver and a pinch of rosemary into each cut. Rub the whole thing with oil and season it properly. Scatter the onions across the base of a roasting tin, sit the lamb on top, squeeze over the lemon and tuck the spent halves in beside it. Pour in a splash of water or white wine — about 150ml — to stop the onions catching.

The Slow Cook: Heat, Time and Covering

Set the oven to 160°C (140°C fan, gas mark 3). Cover the tin tightly with foil, or use a lid if your roasting tin has one, and put it in the middle of the oven. Leave it alone for three and a half hours. If you're in and out of the kitchen, baste it once or twice, but there's no need to fuss.

• Three to three and a half hours covered at 160°C — this is where the meat breaks down
• Twenty-five to thirty minutes uncovered at 200°C (180°C fan, gas mark 6) to crisp the fat on top
• The test: the bone should wiggle freely in its socket, and a fork should twist through the meat with no resistance at all

If it's still fighting back, put the foil back on and give it another half hour. Shoulder is almost impossible to overcook, which is precisely the point.

Minted Peas and Buttered New Potatoes

Scrub 800g of new potatoes — don't peel them, the skins are the best bit — and boil them in well-salted water for fifteen to twenty minutes, until a knife slips in without a fight. Drain, return to the dry pan with 40g of butter, a handful of chopped mint and parsley and a good twist of pepper. Clap the lid on and shake the pan so every potato gets coated.

For the peas, use 300g of frozen petits pois or the same weight podded fresh. Simmer them with a couple of tablespoons of the lamb's cooking juices spooned from the tin, just enough water to keep them moving, for two or three minutes. Drain, then stir through a knob of butter and a generous handful of chopped mint. Crush a few peas against the side of the pan with a fork to thicken the buttery coating, then taste and season. Serve straight away, while the mint still smells green.

Gravy, Resting and Getting It to the Table

Lift the lamb onto a warm plate, cover it loosely with foil and let it rest for twenty to thirty minutes. This is not optional — the meat reabsorbs its juices and shreds far more cleanly afterwards.

Meanwhile, spoon the fat off the roasting tin, leaving the onions and sticky juices behind. Set the tin over a medium heat, stir in a tablespoon of plain flour and cook it out for a minute. Pour in a glass of white wine or a ladle of stock, scraping the bottom of the tin as it bubbles, then add 300–400ml more stock and simmer for five to eight minutes until it coats the back of a spoon. Strain it if you want something smooth, or leave it rustic with the onions in. Season to taste.

To serve, pull the lamb apart with two forks into rough chunks and pile it onto warm plates with the potatoes alongside, the peas spooned over and the gravy passed round separately.

Leftovers and Seasonal Tweaks

Shredded lamb keeps beautifully for three days in the fridge and improves overnight. Fold it through a white bean stew with a spoonful of harissa, tuck it into warm pittas with minted yoghurt and cucumber, or pile it onto toast and spoon the leftover peas on top.

The formula bends with the season. In spring, swap the peas for podded broad beans and add purple sprouting broccoli. Come autumn, serve it with mash and braised red cabbage instead, and use cider in the gravy rather than wine. Once you've cooked shoulder this way a few times, you'll stop measuring and start cooking by feel — which is exactly how the best everyday British cooking works.