The Sourdough Jack is a signature Jack in the Box cheeseburger consisting of a beef patty topped with bacon, tomato, Swiss-style cheese, Mayo-Onion sauce, and ketchup on toasted sourdough bread.[1] It has been compared to a patty melt.[2]


In 1995, Jack in the Box introduced antenna balls as Jack's "sales force" for the Sourdough Jack.[3]


In 2000, a Beaverton, Oregon couple sued Jack in the Box for $7 million after allegedly finding staples and hair in their Sourdough Jacks.[4]


"Sourdough Jack" is also the name of a cartoon character used since 1952 by the Fairbanks Daily News-Miner, an Alaskan newspaper.[5]


  1. Jack In The Box | Sourdough Jack®
  2. Review: Jack in the Box - Sourdough Jack | Brand Eating
  3. On the Rebound: Antenna Balls Bounce Back As Must-Have Car Accessory. The Free-Lance Star. August 6, 2001.
  4. Couple files lawsuit over fast-food burgers. Eugene Register-Guard. July 29, 2000.
  5. Fairbanks Daily News-Miner - Wikipedia, the free encyclopedia

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