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.
Make certain the grill is extremely hot by allowing it to heat for 10 minutes before adding the steaks. Place the meat on the hottest portion of the grill and cook, undisturbed for 7 to 10 minutes per side for rare meat or 8 to 12 minutes for medium-rare.If you'd like the steaks to have cross-hatch marks, turn the meat 30 degrees after the first three to four minutes of cooking time has elapsed for each side.ortunately, you can avoid disappointingly tough, over-cooked porterhouse steaks by understanding the basic precepts of successfully cooking thick steaks on the grill -- how to prepare the meat in advance, how long to cook the cook the steaks and how to correctly judge their doneness.