Smashburger Signature Creamy Sauce

This Smashburger signature creamy sauce has been a small but transformative element in my weeknight cooking rotation. I first tasted a version of this while grabbing a quick burger years ago, and I remember thinking how a simple spoonful of sauce could elevate a basic patty into something memorable. After a few experiments at home and adjusting the balance of sweet, tangy, and smoky notes, I landed on this combination that now lives in a jar in my fridge almost constantly. It’s a condiment that brings texture, brightness, and a hint of heat without overpowering the main ingredients.

What I love most is how flexible it is. I discovered this formula on a rainy Sunday when pantry staples were all I had, and the final flavor profile felt both nostalgic and balanced: creamy mayonnaise as the base, sweet pickle relish for crunch and sweetness, ketchup for acidity and body, Dijon for a subtle bite, and smoked paprika and Montreal seasoning for a savory, slightly smoky depth. The result is silky, slightly tangy, and incredibly easy to tailor. It became our family's go-to dipping sauce for burgers, fries, and even roasted vegetables—my kids call it “the magic sauce.”

Ingredients

• Mayonnaise (1 cup): The foundation provides rich, silky texture. Use a full-fat, high-quality brand like Hellmann’s or Duke’s for the creamiest mouthfeel. If you prefer a lighter version, choose an olive-oil mayonnaise for a slightly fruitier note.
• Sweet pickle relish (2 tablespoons): Adds sweetness, acidity, and texture. Look for relishes with visible bits of finely chopped pickles for crunch; Mt. Olive or Heinz both work well. Drain any excess liquid to avoid thinning the sauce.
• Ketchup (2 tablespoons): Contributes tang, color, and a touch of sugar. Use your preferred brand; the tomato base rounds the sauce and helps it cling to burgers and fries.
• Dijon mustard (2 teaspoons): Provides subtle heat and sharpness to cut through the richness. Grey Poupon or Maille offer a smooth, piquant flavor that lifts the mixture.
• Montreal steak seasoning (1/2 teaspoon): A smoky, peppery touch—adds depth and savory complexity. Use a reliable blend like McCormick Montreal Steak Seasoning.
• Smoked paprika (1/2 teaspoon): Imparts a warm, smoky aroma without heat. Spanish smoked paprika (pimentón) is ideal for an authentic smoky profile.
• Worcestershire sauce (1/4 teaspoon): A little umami booster that deepens the savory backbone. Optional if you keep vegetarian Worcestershire on hand; otherwise a classic Lea & Perrins works well.

Instructions

Combine the ingredients: Place 1 cup mayonnaise, 2 tablespoons sweet pickle relish, 2 tablespoons ketchup, 2 teaspoons Dijon mustard, 1/2 teaspoon Montreal steak seasoning, 1/2 teaspoon smoked paprika, and 1/4 teaspoon Worcestershire sauce into a small mixing bowl. Use measuring spoons and cups for consistent results. If your relish is particularly watery, spoon it into a fine sieve and let excess liquid drain for a minute to avoid thinning the final texture. Stir until smooth: Use a small whisk or a fork to stir the mixture vigorously until completely homogeneous and smooth—about 30 to 45 seconds. Scrape down the sides of the bowl to incorporate any bits of seasoning. Taste and adjust: if you want a brighter note, add an extra 1/4 teaspoon Dijon; for more sweetness, a small pinch of sugar or an extra 1/2 teaspoon of ketchup can be used. Chill and marry the flavors: Transfer the sauce to an airtight container and refrigerate for at least 30 minutes to let the flavors meld. Overnight refrigeration will deepen the blend even further. Stir the sauce again before serving to re-emulsify and check seasoning one last time. Use within 7–10 days and always keep refrigerated.

Storage Tips

Store the sauce in a clean, airtight jar or container in the refrigerator. Mason jars with tight lids or small food-safe plastic containers work well. Label the container with the date and use within 7–10 days for best freshness. Avoid cross-contamination by using a clean spoon each time you scoop sauce out. If the sauce thickens excessively after refrigeration, stir in 1 to 2 teaspoons of warm water or a little extra ketchup to loosen it before serving. Never leave the sauce at room temperature for more than two hours during serving; discard if it has been out longer.

Ingredient Substitutions

If you need to adapt, several swaps keep the texture and similar flavor. For egg-free versions, use vegan mayonnaise and swap Worcestershire for a splash of soy sauce or coconut aminos plus a pinch of smoked paprika for depth. Plain dill relish can replace sweet relish for a tangier profile—reduce additional sugar if using dill. Whole-grain mustard can replace Dijon for more texture and a robust mustard flavor. To reduce calories, substitute half the mayo with plain Greek yogurt, though this will add tang and slightly change mouthfeel—start with a 50/50 mix and adjust to taste.

Serving Suggestions

This sauce shines on smashed or grilled burgers—spread it on toasted buns and top with a melty cheese. It’s equally delicious as a dip for crispy fries, onion rings, or potato wedges. Try drizzling it over roasted sweet potatoes or using it as a dressing for a simple cabbage slaw to add creaminess and tang. For a party platter, serve alongside sliced veggies and chicken tenders; its balanced sweetness and smoke make it a crowd-pleasing complement to fried or grilled items.

Cultural Background

The creamy condiment category has roots across many culinary traditions, from American burger culture to European sandwich spreads. This condensed formula draws on classic American diner flavors—mayonnaise-based sauces with ketchup and pickle relish evoke the “special sauce” styles that rose to popularity alongside fast-casual burger concepts. Adding Dijon and smoked paprika nods to modern, chef-driven interpretations that refine the balance with sharper and smokier notes while keeping the nostalgic comfort of the original inspiration.

Seasonal Adaptations

In summer, brighten the sauce with a teaspoon of fresh lemon juice and swap sweet relish for quick-pickled cucumbers for a lighter, fresher profile. In cooler months, deepen the flavor by stirring in 1/2 teaspoon of chipotle in adobo for warmth and a smoky kick. Holiday gatherings benefit from replacing the relish with caramelized shallots or roasted red pepper finely chopped to make the sauce feel more seasonal and luxurious.

Meal Prep Tips

Make a double batch and keep it on hand for busy weeks—portion into 2-ounce containers for lunches and packed sandwiches. If you prefer consistent texture, whisk the sauce briefly just before portioning. When assembling sandwiches ahead of time, spread a thin layer on the bun to prevent sogginess from wet toppings; keep wet ingredients like tomatoes separate until serving. This approach keeps sandwiches fresh and helps the sauce perform as a flavor anchor without making bread soggy.

Final thought: this creamy sauce is a small addition that makes routine meals feel intentional and delicious. Keep experimenting with minor adjustments until it’s perfect for your family—once you’ve dialed it in, it becomes a reliable, beloved staple.