Jack in the Box Wiki


The Sourdough Jack is a signature Jack in the Box cheeseburger consisting of a beef patty topped with bacon, tomato, Swiss-style cheese, mayonnaise, and ketchup on toasted sourdough bread.[1]

The Sourdough Jack has been compared to a patty melt.[2] A Jack in the Box spokesperson once called it "an adult spin on the more traditional hamburger."[3]

The burger was originally released as the "Grilled Sourdough Burger" in 1989, with the name changed to "Sourdough Jack" in 1997.[4] It previously used Mayo-Onion sauce instead of mayonnaise.[5]

In March 2021, the official Jack Box Twitter account announced the Sourdough Jack would be discontinued, but it was only an April Fools Day joke.[6][7]



The Jack-In-The-Box Grilled Sourdough Burger

In 1995, Jack in the Box introduced antenna balls as Jack's "sales force" for the Sourdough Jack.[8]


In 2000, a Beaverton, Oregon couple sued Jack in the Box for $7 million after allegedly finding staples and hair in their Sourdough Jacks.[9]


"Sourdough Jack" is also the name of a cartoon character used since 1952 by the Fairbanks Daily News-Miner, an Alaskan newspaper.[10]


  1. Jack In The Box - Sourdough Jack®. Jack in the Box. Accessed December 29, 2021.
  2. Q. Review: Jack in the Box - Sourdough Jack. Brand Eating. April 12, 2011.
  3. Bundy, Beverly. "Greek sandwich merges into American mainstream." Fort Worth Star-Telegram. March 3, 1993.
  4. Macias, Sandra. "Hearty appetites will feel at home at Big Ed's." Reno-Gazette-Journal. March 5, 1997.
  5. Jack In The Box | Sourdough Jack®. Jack in the Box. Archived March 5, 2014.
  6. @JackBox. "Hate to sour your day, but sadly, I'm taking the Sourdough Jack off of our menu. Say goodbye while you can and get the Sourdough Jack for just $3 on the Jack App." Twitter, 30 Mar. 2021, <https://twitter.com/JackBox/status/1376947481259384835>.
  7. @JackBox. "Sourdough Sike! April Fooled ya! There’s already a sourdough king that's been around for 30 years. It’s called the Sourdough Jack and it's here to stay! So grab one for free with any app purchase when you download the Jack app #NationalSourdoughBreadDay." Twitter, 1 Apr. 2021, <https://twitter.com/JackBox/status/1377627971251490824>.
  8. On the Rebound: Antenna Balls Bounce Back As Must-Have Car Accessory. The Free-Lance Star. August 6, 2001.
  9. Couple files lawsuit over fast-food burgers. Eugene Register-Guard. July 29, 2000.
  10. Fairbanks Daily News-Miner - Wikipedia, the free encyclopedia