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.
Quick pan sear first then roast in oven 350 degrees for 12-15 minutes if you want medium rare. This dish has a classic simplicity, and its preparation is similarly streamlined. Just brown lemon-and-thyme-seasoned lamb chops quickly, then serve drizzled with a lemony reduction of its own cooking juices. If you enjoy wine with such a main dish, try a fruity young Beaujolais, lightly chilled. Preparation time: 5 minutes. Chilling time: 1/2 to 1 hour. Cooking time: 8 to 10 minutes.