Ingredients
1 bone-in beef rib roast (6 1/2 to 7 pounds), room temperature
Coarse salt and ground pepper
3 pounds Yukon gold potatoes, scrubbed and cut into 1 1/2-inch pieces
6 garlic cloves, peeled and smashed
2 sprigs fresh rosemary
Preparation
Preheat oven to 400 degrees, with racks in upper and lower thirds. Place beef on a large rimmed baking sheet; season generously with salt and pepper. Roast on upper rack for 45 minutes; move to lower rack. Remove 3 to 4 tablespoons of fat from beef and place on a second rimmed baking sheet with potatoes, garlic, and rosemary. Season with salt and pepper and toss to combine; place on upper rack. Roast beef until an instant-read thermometer inserted in the thickest part registers 110 degrees, 45 to 60 minutes more. Remove beef from oven and tent loosely with aluminum foil; let rest until internal temperature registers 130 degrees, about 30 minutes. Continue to roast potatoes, tossing occasionally, until golden, 25 to 30 minutes more. Slice beef and serve with potatoes.
