What is the story behind Every Jack in the Box Burger Ranked: Where Does the Sourdough Jack Stand? Get the answers here.

More than three decades after its initial release, the Sourdough Jack avoids the scrapheap of discontinued fast food novelties because it solves an engineering flaw common across drive-thru menus: standard burger buns get soggy under bacon fat and hot beef grease. By substituting a griddled artisan-style bread and balancing fat with an acidic sauce, Jack in the Box built a sandwich with enduring appeal. While modern smash patties give it serious competition for the top spot, the Sourdough Jack remains a benchmark of mid-tier drive-thru menus.