500gfresh greenssuch as white cabbage, Savoy cabbage, Brussels tops or cavolo nero, leaves separated, stalks finely sliced
1largebunch fresh rosemary
2kglamb shoulder(about 4 ½ lbs)
olive oil
sea salt and freshly ground pepperto taste
1bulbgarlicunpeeled and broken into cloves
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Instructions
Preheat your oven to full whack (450 to 500°F). Slash the fat side of the lamb all over with a sharp knife. Lay half the sprigs of rosemary and half the garlic cloves on the bottom of a high-sided roasting tray, rub the lamb all over with olive oil and season with salt and pepper.
Place it in the tray on top of the rosemary and garlic, and put the remaining rosemary and garlic on top of the lamb.
Tightly cover the tray with tinfoil and place in the oven. Turn the oven down immediately to 170°C/325°F/gas 3 and cook for 4 hours – it's done if you can pull the meat apart easily with two forks.
Notes
Leftovers will keep well in the refrigerator for up to 3 days. As lamb shoulder is quite a fatty roast, they're best enjoyed warmed through in wraps and flatbreads, rather than cold in sandwiches.