In a large bowl, combine bread crumbs, garlic, rosemary, 1 teaspoon salt and 1/4 teaspoon pepper. Toss in 2 tablespoons olive oil to moisten mixture. Set aside. Season the rack all over with salt and pepper. Heat 2 tablespoons olive oil in a large heavy oven proof skillet over high heat. Sear rack of lamb for 1 to 2 minutes on all sides. Set aside for a few minutes. Brush rack of lamb with the mustard. Roll in the bread crumb mixture until evenly coated.
For the lamb, place the lamb steak into a bowl, rub with the olive oil and season with salt and freshly ground black pepper. Heat a griddle pan and chargrill the steak for 5-6 minutes on each side, or until cooked to your liking. Leave to rest for five minutes.
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!