Management was using a "barbell" menu strategy to introduce new products at both the premium and low-priced ends of the product continuum. as part of the strategy, the company introduced in 2010 the premium steakhouse XT burger line and BK Fire-grilled ribs, the first bone-in pork ribs sold at a national fast-food hamburger restaurant chain. at the other end of the menu, the company introduced in 2010 the quarter-pound double cheeseburger, the buck double, and the us$1 BK breakfast muffin sandwich.