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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!
Tip: As a rule, roast a leg of lamb for 15 minutes per 500g, plus 10 minutes more. Allow it to rest for a good 15 minutes before serving to ensure the juices redistribute, making a perfect roast. Preheat oven to 180 degrees C. 2  Cut slits in the top of the leg of lamb every 3cm apart deep enough to push slices of garlic down into the meat. 3  Sprinkle salt and pepper generously all over the top of lamb. 4  Place several sprigs of rosemary under and on top of the lamb.