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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!
1 Pour red wine into the roasting pan. 2  Cook the lamb for 25 minutes at 425Â°F then turn the oven temperature down to 375Â°F and continue to roast until a meat thermometer reads 145Â°F (for medium-rare) to 160Â°F (for medium), about an hour and a half.hould you choose to use a boneless leg of lamb, apply the same method of preparation but adjust the cooking time slightly. For a rare to medium-rare roast, your meat thermometer should read 135Â°F. 1  Let your leg of lamb sit at room temperature for an hour before you plan to cook it.