A beef between a pair of fast-food burger chains might be cooking up. This week, Burger King announced it plans to test sliders at locations in two U.S. cities, including in White Castle’s backyard.

Burger King is testing a new lineup of slider-sized burgers in two U.S. cities, as the thriving fast-food chain continues to refresh its menu and attract customers seeking more variety and flexible ...

Add Yahoo as a preferred source to see more of our stories on Google. Burger King just revealed it's testing a series of new sliders that it designed "for whatever craving strikes." Fast forward to ...