M&S Collection British Rib of Beef British boneless rib of beef, dry-aged in a salt chamber for 30 days for an intense flavour and succulence, then carefully taken off the bone and hand tied. This tender, deeply flavoursome cut benefits from a small amount of internal fat which bastes the joint as it cooks. Simply roast in the oven. Serves 6. Welcome to Collection from M&S, where exceptional quality and intricate attention to detail makes for something truly special.