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For quick roasting, preheat the oven at 200C/400F/Gas mark 6, then allow 35 minutes per 450g/1lb plus an extra 20 minutes. Thus, an 800g lamb leg will be done in about 80 minutes. For slow roasting, preheat the oven at 180C/350F/Gas mark 4, then allow 35 minutes per 450g/1lb plus an extra 35 minutes.An 800g will be done in approximately 95 minutes. Learn how to roast a leg of lamb at The Kitchn.Try leg of lamb recipes at any of these sites: AllRecipes UK BBC Food Tip!or slow roasting, preheat the oven at 180C/350F/Gas mark 4, then allow 35 minutes per 450g/1lb plus an extra 35 minutes. An 800g will be done in approximately 95 minutes. Learn how to roast a leg of lamb at The Kitchn. Try leg of lamb recipes at any of these sites: AllRecipes UK BBC Food Tip!
The following tips for roasting leg of lamb are based on a 4-pound leg of lamb, well-trimmed, boned, rolled, and tied. For a bone-in leg of lamb, add 5 minutes per pound to roasting time.1  Preheat oven to 400 Â° F. Combine ingredients for seasoning rub, as desired. 2  Rub mixture over surface of lamb. 3  At this point lamb may be covered and refrigerated up to 24 hours before roasting. Reduce oven temperature to 325 Â° F. Roast 20 minutes per pound until roast registers 150 Â° F for medium. 2  Transfer roast to cutting board; tent with foil. 3  Let stand 10 minutes before carving. 4  Temperature of roast will continue to rise 5 Â° F to 10 Â° F during stand time.