Jack in the Box Sourdough Jack

Jack in the BoxBurgers

Jack in the Box's Sourdough Jack is a beef patty with Swiss cheese, bacon, tomato, and mayo grilled between two slices of toasted sourdough bread. One of the most distinctive burgers in fast food thanks to the sourdough format, it has a cult following on the West Coast and has no direct equivalent at McDonald's, Burger King, or Wendy's.