In and Out Sauce is a creamy, tangy condiment inspired by the iconic fast-food chain’s secret recipe, and it’s surprisingly easy to make at home with just a few pantry staples. This versatile sauce works as a burger topping, dipping sauce for fries, or a flavor booster for sandwiches and wraps that transforms ordinary meals into something memorable.
Once you taste the homemade version, you’ll wonder why you ever settled for the bottled stuff.
Why You’ll Love This Recipe
This sauce delivers restaurant-quality results in under five minutes with ingredients you probably already have on hand. It’s affordable, customizable, and tastes infinitely better than anything you can buy in a jar.
- Ready in less than five minutes with zero cooking required
- Uses simple, everyday ingredients like mayo, ketchup, and pickles
- Creamy, tangy, and slightly sweet flavor profile that complements almost any savory dish
- Makes about one cup, so a little goes a long way
- Stores in the fridge for up to two weeks, perfect for meal prep
My Experience Making This Recipe
I first recreated this sauce on a lazy Sunday afternoon when my family was craving burgers but I wanted to skip the drive-through. The moment I mixed those first few ingredients together, I knew I’d cracked something special.
My kids devoured their burgers and actually asked for seconds, which rarely happens. The sauce was creamy without being heavy, and that pickle relish gave it just enough personality to feel like an actual treat rather than assembly-line food.
Now I batch this sauce every couple of weeks and keep it ready for quick dinners, picnics, and impromptu cookouts. Friends always ask for the recipe after tasting it, and I love watching their faces when I tell them how ridiculously simple it is.
Recipe Overview
- Recipe Name: In and Out Sauce
- Servings: Makes about 1 cup (16 servings of 1 tablespoon each)
- Prep Time: 5 minutes
- Cook Time: 0 minutes
- Total Time: 5 minutes
- Course: Condiment or Sauce
- Cuisine: American
- Calories per Serving: 45
Equipment You Will Need
- Small mixing bowl
- Measuring spoons
- Measuring cups
- Spoon or small whisk for stirring
- Airtight container for storage
Ingredients for In and Out Sauce
- 1 cup mayonnaise
- 1/4 cup ketchup
- 2 tablespoons sweet pickle relish
- 1 tablespoon yellow mustard
- 1/2 teaspoon paprika
- 1/4 teaspoon garlic powder
- 1/4 teaspoon onion powder
- 1/8 teaspoon cayenne pepper (optional, for a slight kick)
- Salt and black pepper to taste
- 1/2 teaspoon fresh lemon juice
Ingredient Notes and Substitutions
- Mayonnaise: It’s the creamy base that holds everything together and creates that rich mouthfeel. You can swap it with Greek yogurt for a tangier, lighter version, though you’ll lose some richness and need to adjust consistency with a splash of milk.
- Sweet pickle relish: This adds tang and texture that defines the sauce’s character. Finely diced dill pickle chips or bread-and-butter pickles work in a pinch, though you’ll need to mince them finely and drain excess liquid.
- Ketchup: It provides sweetness and acidity to balance the mayo. Tomato paste mixed with a tiny bit of sugar and vinegar can replace it, but start with half the amount since it’s more concentrated.
- Yellow mustard: This brings a subtle tang and depth without overpowering. Dijon mustard works too, though it’ll taste sharper and more sophisticated.
- Paprika: It adds color and a faint smoky note. Smoked paprika intensifies this effect if you enjoy a deeper flavor, but use the same amount.
How to Make In and Out Sauce
Step 1: Gather Your Ingredients
Pull out all your ingredients and measure them before you start mixing. Having everything prepped saves time and prevents you from forgetting anything once you start combining flavors.
Step 2: Add the Mayonnaise Base
Pour one cup of mayonnaise into your small mixing bowl. This is your creamy foundation that will carry all the other flavors smoothly.
Step 3: Mix in the Ketchup
Add one-quarter cup of ketchup to the mayo and stir well until the mixture turns a light peachy color. The ketchup distributes sweetness and acidity throughout, so make sure it’s fully blended with no white streaks.
Step 4: Incorporate the Pickle Relish
Stir in two tablespoons of sweet pickle relish along with any liquid in the jar. The relish adds that signature tangy, slightly sweet punch that makes people ask what’s in this sauce.
Step 5: Add the Mustard and Spices
Mix in one tablespoon of yellow mustard, half a teaspoon of paprika, and one-quarter teaspoon each of garlic powder and onion powder. These seasonings create depth and prevent the sauce from tasting one-dimensional.
Step 6: Include Optional Heat
If you like a little kick, add one-eighth teaspoon of cayenne pepper now. Start conservatively because you can always add more, but you can’t take it out.
Step 7: Finish with Acid and Seasoning
Squeeze in one-half teaspoon of fresh lemon juice and taste the sauce. Lemon brightens all the flavors and prevents the sauce from tasting heavy or flat.
Step 8: Season to Taste
Add a pinch of salt and black pepper, stir thoroughly, and taste again. Every brand of mayo and ketchup varies slightly, so adjusting the seasoning at the end ensures your sauce tastes perfect.
Pro Tip: Make a double or triple batch on Sunday and store it in an airtight jar in the fridge; it actually tastes better after a day or two once all the flavors marry together.
Tips for the Best In and Out Sauce
- Use full-fat mayonnaise for the creamiest, richest texture that mimics the original sauce. Low-fat versions can make it taste thin and chalky.
- Fresh lemon juice matters more than you’d think; bottled lemon juice tastes metallic and won’t brighten the sauce the same way.
- If your sauce tastes too thick, thin it slightly with a teaspoon of milk or the pickle juice from the relish jar until you reach your preferred consistency.
- Chill the sauce for at least 30 minutes before serving if you have time; cold sauce tastes more balanced and satisfying on a burger.
- Taste as you go and remember that flavors intensify after a few hours, so go light on the cayenne and salt initially.
- Keep it covered in the fridge to prevent it from absorbing other flavors or developing a skin on top.
Common Mistakes to Avoid
- Skipping the lemon juice because you think it won’t matter. It absolutely does; it’s what prevents the sauce from tasting like plain mayo with stuff in it.
- Using low-quality mayo or mayo that’s been sitting open in the fridge for months. Start with fresh, full-fat mayo for a noticeably better result.
- Forgetting to drain excess liquid from the pickle relish before mixing it in. Too much liquid throws off the balance and makes the sauce runny.
- Adding all the spices at once without tasting along the way. You might end up with garlic powder overpowering everything else.
- Storing it in a container that isn’t airtight or in the warmest part of your fridge. These factors speed up spoilage and expose the sauce to off-flavors.
Serving Suggestions
This sauce shines on burgers and fries, but it’s far more versatile than that. Spread it on sandwiches, use it as a dipping sauce for chicken tenders, or dollop it on grilled fish for unexpected richness.
- Classic cheeseburgers with lettuce, tomato, and onion
- French fries for dipping or drizzling
- Crispy fried chicken sandwiches
- Turkey or roast beef sandwiches instead of plain mayo
- Grilled fish tacos with cabbage slaw
Variations to Try
- Spicy In and Out: Increase cayenne to one-quarter teaspoon and add one-half teaspoon of hot sauce for a sauce that packs real heat without losing its original character.
- Dill Pickle Version: Replace sweet relish with dill pickle relish and add one-quarter teaspoon of dried dill for a tangier, more herbaceous sauce that pairs beautifully with fish.
- Sriracha Kick: Reduce ketchup to two tablespoons and stir in one tablespoon of sriracha for an Asian-inspired take that works great on chicken or pork burgers.
- Smoky BBQ Blend: Add one-quarter teaspoon of smoked paprika, one-eighth teaspoon of liquid smoke, and one tablespoon of BBQ sauce for a sauce that tastes like it belongs on pulled pork.
- Fresh Herb Version: Stir in one tablespoon of fresh minced dill or parsley and one-half teaspoon of fresh chives for brightness that lifts the entire sauce.
Dietary Adaptations
- Gluten-Free: Check your ketchup and mustard labels since some brands contain hidden gluten; use certified gluten-free versions and the sauce stays completely safe. The trade-off is minimal since most mayo and relish are naturally gluten-free.
- Dairy-Free: Replace mayonnaise with a quality dairy-free mayo brand like Hellmann’s or Miyoko’s and the sauce tastes nearly identical. The result is slightly lighter but still creamy and satisfying.
- Vegan: Use vegan mayo and check that your relish, ketchup, and mustard don’t contain animal products; most mainstream brands work fine. The flavor remains exactly the same.
- Low-Carb/Keto: Substitute regular ketchup with a no-sugar-added version and use a reduced-sugar relish to keep carbs minimal. You lose a tiny bit of sweetness but gain a sauce that fits easily into your macros.
Storage and Reheating
Refrigerator
Store the sauce in an airtight container on a shelf in the fridge away from the door, where temperature fluctuates. It keeps safely for up to two weeks and actually tastes better after a day or two once flavors meld.
- Use a glass or plastic container with a tight-fitting lid
- Label it with the date you made it for easy tracking
- Don’t store it in the door where it gets warmer from opening and closing
Freezer
Freezing this sauce is possible but not recommended since mayo-based condiments can separate when thawed. If you do freeze it, expect the texture to shift slightly after defrosting.
- Freeze in ice cube trays for portion-controlled amounts if you must
- Transfer to a freezer bag once frozen and label with the date
- Use within one month for best quality
Reheating
This is a cold sauce, so reheating doesn’t apply. Let it sit at room temperature for five to ten minutes before serving if you prefer it less cold straight from the fridge.
- Never microwave mayo-based sauces as they can break and separate
- Stir well before serving if it’s been sitting in the fridge for a few days
Nutrition Information
| Nutrient | Amount |
|---|---|
| Calories | 45 |
| Total Fat | 4.2g |
| Saturated Fat | 0.7g |
| Carbohydrates | 2.1g |
| Fiber | 0g |
| Sugar | 1.8g |
| Protein | 0.1g |
| Sodium | 135mg |
| Cholesterol | 3mg |
These values are approximate and based on standard ingredient brands. Nutritional content varies depending on which mayo and ketchup you use, so check your specific labels if you’re tracking macros closely.
Frequently Asked Questions
Can I make this sauce without pickle relish?
You can, but the sauce will taste flat and one-dimensional without that tangy pickle component. If you truly don’t have relish, finely mince one-quarter cup of dill pickles, drain them well, and use that instead.
How long does this sauce actually last in the fridge?
It stays fresh and safe for up to two weeks if stored in a clean, airtight container. After that, the flavors fade and it may develop off-tastes even if it looks fine.
What if my sauce is too thin or too thick?
If it’s too thick, whisk in milk or pickle brine one teaspoon at a time until you reach the right consistency. If it’s too thin, you likely added too much liquid from the relish; just stir in a touch more mayo to thicken it back up.
Can I use this sauce on things other than burgers?
Absolutely; try it on fried chicken sandwiches, fish tacos, grilled vegetables, or even as a dipping sauce for shrimp. It works anywhere you’d use regular mayo but want more personality.
Why does homemade taste better than the bottled version?
Store-bought versions often contain preservatives, stabilizers, and lower-quality ingredients that affect flavor and texture. When you make it fresh at home with real mayo and fresh seasonings, every bite tastes brighter and cleaner.
Can I batch this for meal prep?
Yes, and that’s actually one of my favorite ways to use this recipe since it makes about one cup. Make a big batch on Sunday, divide it into smaller containers, and grab a container whenever you need it during the week.
Final Thoughts
Making In and Out Sauce at home is one of those ridiculously simple cooking wins that feels fancy but requires almost no skill. In five minutes, you’ll have a condiment that tastes better than anything you can buy and costs just pennies to make.
Stop settling for boring burgers and sad sandwiches; try this sauce tonight and watch your family actually get excited about dinner again. Once you taste the difference that fresh, homemade sauce makes, you’ll be making batches of this stuff on repeat.
In and Out Sauce
Ingredients
Equipment
Method
- Gather and measure all ingredients before you start mixing.
- Add the mayonnaise to a small mixing bowl as the creamy base.
- Stir in the ketchup until the mixture is an even light peach color.
- Mix in the sweet pickle relish, including a bit of its liquid for tang.
- Add yellow mustard, paprika, garlic powder, and onion powder; stir until fully combined.
- For heat, sprinkle in cayenne pepper if using and blend well.
- Stir in fresh lemon juice, then season with salt and black pepper to taste.
- Transfer the sauce to an airtight container and refrigerate 30 minutes for flavors to meld, or serve immediately.
