Burger King wants to lure American customers during the northern summer with a barbecue party - and a bacon sundae. The world\'s second biggest hamburger chain is launching several beef and chicken sandwiches as limited time offers. And for a sweet ending, the company is also offering a bacon sundae - vanilla soft serve with fudge, caramel, bacon crumbles and a piece of bacon. The salty-sweet dessert clocks in at 510 calories, 18g of fat and 61g of sugar. The limited-time items are Burger King\'s the latest push to win back customers with a revived menu. Earlier this year, Burger King launched its biggest-ever menu expansion including fruit smoothies, snack wraps and new salads. The items were intended to go after a broader audience of mums and families, a shift from the chain\'s previous strategy of courting young men with calorie bombs. Core menu items, such as french fries and the Whopper, have also been tweaked as part of the company\'s efforts to improve food quality.