The steak and potatoes are both grilled at the same time, before being topped with crumbled blue cheese, which melts all over the dish.
This recipe is courtesy of Martha Stewart.
Stir garlic, rosemary, Worcestershire sauce, and oil together in a baking dish. Season with pepper. Place steak in the dish, cutting to fit as necessary. Coat both sides with marinade. Marinate, turning once, for at least an hour.
Cover potatoes with cold water in a medium saucepan. Add a pinch of salt. Bring to a boil. Reduce heat and simmer until just tender, about 15 minutes. Drain, and let cool slightly. Slice potatoes in half, and brush lightly with oil. Season with salt and pepper.
Grill steak, turning once, to desired doneness — 3-4 minutes per side for medium rare. Set aside.
Meanwhile, grill the potatoes, turning once, until lightly browned, about 5 minutes. Immediately sprinkle the potatoes with cheese.
Thinly slice steak against the grain. Divide steak and potatoes between 4 plates. Serve garnished with rosemary sprigs.