Burger King this week will announce new summer menu LTOs that include the returns of the Carolina BBQ Whopper/Chicken and Memphis Pulled Pork sandwiches. But there will be one audacious difference: The menu includes a boneless BK Rib Sandwich that can be seen as an answer to rival McDonald’s popular McRib.McRib first appeared on the McDonald’s menu as a limited-time offer in 1981. It was offered in the U.S. back in December. Since its creation, it has reappeared irregularly while building a very loyal fan base (see @McRibWatch on Twitter) that clamors for it to be offered permanently. Its popularity is global. McDonald’s stores in Austria last year introduced a deep-fried-patty version called McRibster.