Sourdough Jack

Sourdough Jack

The Sourdough Jack is one of the most iconic and recognizable burgers on the Jack in the Box menu, delivering a unique flavor experience thanks to its signature toasted sourdough bread. Priced at $6.79 and offering 690 calories, this sandwich stands apart from traditional burgers by combining a crispy yet tender sourdough base with smoky bacon, melted cheese, and a seasoned beef patty. It’s the perfect balance of tangy, savory, and rich—exactly the type of flavor variety that longtime Jack in the Box fans appreciate.

What truly defines the Sourdough Jack is its sourdough bread, a choice that immediately sets it apart from typical fast-food burgers. Instead of a soft bakery bun, the toasted sourdough slices add a special tanginess and a crispy texture with every bite. The sourdough is lightly buttered, grilled, and pressed until golden brown on the outside while remaining soft inside. This contrast in texture adds depth to the overall burger experience and enhances how the other ingredients come together.

Another standout feature is the rich, smoky layer of hickory-smoked bacon. The bacon brings a crunchy, savory, and slightly sweet flavor that pairs beautifully with the tang of the sourdough and the juiciness of the beef patty. When combined with the mayo and ketchup, the bacon helps create a balanced bite that’s both hearty and flavorful without feeling overwhelming.

Inside the sandwich, you’ll find a 100% beef jumbo patty seasoned on the grill. The patty is thick, juicy, and full of natural flavor. Grilling enhances its texture while bringing out a slightly smoky finish that complements the bacon and Swiss cheese. This patty is the heart of the Sourdough Jack, and its size ensures the sandwich is filling enough to satisfy strong appetites.

To enhance the richness, Jack in the Box includes melted Swiss-style cheese, which adds a smooth, creamy layer that blends with the beef and bacon. Swiss cheese provides a gentler flavor than American cheese, making it a great match for sourdough bread. The cheese melts perfectly over the patty, creating a cohesive, creamy finish.

Freshness comes from the inclusion of sliced tomatoes, which provide juiciness and a contrasting texture. They help break up the richness of the meat, cheese, and bacon, making the burger feel more balanced overall. The mayo and ketchup duo adds creaminess and tang that complete the flavor profile. Mayo brings smooth richness, while ketchup offers sweetness and acidity—both working together to complement the savory ingredients.

Ingredients Breakdown

The Sourdough Jack is built with the following core ingredients:

• Sourdough Bread

• Ketchup

• Mayo

• Tomato

• Hickory-Smoked Bacon

• Swiss Style Cheese

• Jumbo Beef Patty

• Butter

This lineup creates a burger that is tangy, rich, and layered with flavor. The sourdough alone makes the sandwich feel different from classic fast-food burgers, and its crispness pairs well with the creamy, savory components.

Optional Add-Ons

Customers can enhance or personalize their Sourdough Jack with optional toppings such as:

• Mustard

• Good Good Sauce

• Buttermilk Ranch

These additions can make the sandwich tangier, creamier, or richer depending on preference.

Nutritional Information

A full serving of the Sourdough Jack weighs 227g and contains:

The sandwich is rich and filling, with a significant protein count and moderate carbohydrates. Because of its hearty build, it is best enjoyed as a satisfying main meal.

Allergen Information

The Sourdough Jack contains:

• Milk

• Eggs

• Soy

• Wheat

Since ingredient availability can vary, customers with allergies should confirm details with their local Jack in the Box restaurant.

Price & Availability

The average U.S. price for the Sourdough Jack is $6.79, though specific pricing may differ depending on location and operating region. Calories can also vary if the sandwich is customized by removing or adding ingredients.

Final Thoughts

The Sourdough Jack remains a legendary Jack in the Box favorite for good reason. Its toasted sourdough bread alone makes it unique, but the combination of smoky bacon, juicy beef, melted Swiss cheese, and fresh tomato creates a deeply satisfying and balanced flavor experience. Rich yet tangy, crispy yet creamy, it offers everything a specialty sandwich should.

Whether enjoyed alone or as part of a combo meal, the Sourdough Jack is perfect for anyone who wants a more distinctive and flavorful alternative to a classic burger.

Important Notice

Images used in this article may be AI-generated and may not perfectly represent the actual product served in restaurants. Real items may vary in appearance, and prices may differ by region across the United States.