SERVES 6-8. HANDS-ON TIME 15 MIN, OVEN TIME 4½-5 HOURS, BARBECUE TIME 30 MIN, PLUS MARINATING AND RESTING
MAKE AHEAD
Marinate the lamb up to 48 hours ahead, covered in the fridge. Cook the lamb (step 2) for 4 hours the day before. Chill overnight then, on the day, return to the oven for an hour and continue from step 3.
FOOD TEAM’S TIPS
The fat in the lamb bastes the meat with spicy juices as it cooks slowly, adding plenty of flavour and succulence (the steam from the added water helps keep the meat moist too). Be careful as the fatty juices may make the coals flare up.
If you’re not using a barbecue, unwrap the joint and finish it in a hot oven in a roasting tin for…