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In And Out Sauce Recipe (Better-Than-Drive-Thru Copycat!)
If you’ve ever wished you could drizzle that famous burger spread on everything at home, this In And Out Sauce Recipe is your new secret weapon—creamy, tangy, a little sweet, and ready in about 5 minutes.
What Is In And Out Sauce, Really?
Let’s be honest: most of us grew up thinking “burger sauce” meant a squirt of ketchup and maybe some mustard. Then along came the famous In-N-Out burger sauce—rich, tangy, a little mysterious—and suddenly a backyard burger didn’t taste quite as exciting anymore.
This In And Out Sauce Recipe is my homemade version of that iconic fast food sauce copycat. It’s a mayonnaise ketchup relish sauce with a touch of vinegar, sweetness, and spice. Think classic American burger sauce meets thousand island dressing, but thicker, creamier, and made just the way you like it.
I’m 50 now, I’ve hosted more backyard cookouts than I can count, and you know what? Having a go-to secret burger sauce recipe is one of those tiny things that makes you feel wonderfully “put together” in the kitchen. I whip up a batch before casual game nights, summer barbecues, or even “breakfast for dinner” nights when we’re doing smash burgers on the griddle next to the scrambled eggs. No judgment.
This copycat In-N-Out sauce also happens to be:
- No-cook
- Budget-friendly
- Easy to tweak for your taste or diet
And best of all, you don’t have to sit in a drive-thru line to get your fix.
Why You’ll Love This In And Out Sauce Recipe
- 5-minute prep: No cooking, no blender—just stir and chill.
- Tastes like the real thing: That classic fast food burger sauce flavor, right in your own kitchen.
- Pantry-friendly: Uses ingredients you probably already have (mayo, ketchup, pickles, etc.).
- Ultra-versatile: Perfect on burgers, fries, patty melts, grilled chicken sandwiches, and even roasted veggies.
- Easy to customize: Make it sweeter, tangier, smokier, or a full-on animal style sauce recipe with one or two tweaks.
- Better ingredients: You control the quality—use organic mayo, lower-sugar ketchup, or avocado oil mayo if you like.
- Crowd-pleaser: Kids love the creamy burger sauce vibe; adults appreciate the nostalgic fast food flavor.
- Make-ahead friendly: Gets even better after a few hours in the fridge as the flavors meld.
Ingredients For The Best Copycat In And Out Sauce
Here’s exactly what you’ll need to make this homemade In And Out sauce. The measurements are written for a small batch (about 1 cup), which is enough for 4–6 burgers plus dipping.
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1/2 cup mayonnaise
- Use a good-quality, full-fat mayo for the creamiest texture. I like Hellmann’s/Best Foods or an avocado-oil mayo if I’m feeling a little lighter.
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3 tablespoons ketchup
- Regular tomato ketchup works great. If you’re cutting back on sugar, a no-sugar-added ketchup is totally fine.
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2 tablespoons sweet pickle relish
- This is key for that classic tangy-sweet flavor. You can use finely chopped dill pickles instead for a less sweet, more tangy burger condiment sauce.
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1 tablespoon yellow mustard
- Plain old yellow mustard (think ballpark hot dog style) gives that classic American burger sauce taste.
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1 tablespoon finely minced onion (optional but recommended)
- Adds a subtle bite and depth. You can also use 1 teaspoon dried minced onion in a pinch.
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1 teaspoon white vinegar
- Brightens the sauce. Apple cider vinegar works too and gives a slightly fruitier tang.
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1 teaspoon granulated sugar
- Balances the acid and salt. Feel free to adjust up or down to your taste.
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1/2 teaspoon garlic powder
- Gives a warm savory note without being overpowering.
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1/2 teaspoon smoked paprika (or regular paprika)
- Smoked paprika adds that faint grill-kissed flavor; regular paprika gives color and mild flavor.
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1/4 teaspoon kosher salt, plus more to taste
- Start small; once the sauce chills, the flavors strengthen.
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Freshly ground black pepper, to taste
- A few grinds add a nice little bite.
A quick note: if you’re a data nerd like me—I always look at my fridge stats—this recipe, made with standard mayo and ketchup, lands around 90–110 calories per tablespoon. It’s rich, but you don’t need a lot for a big flavor payoff.
Directions: How To Make Homemade In And Out Sauce
You won’t need anything fancy here—just a bowl, a spoon or whisk, and a little patience while it chills.
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Mix the base ingredients
In a medium bowl, add the mayonnaise, ketchup, sweet pickle relish, and yellow mustard.
Stir until the mixture looks smooth and streak-free—the color should be a soft, salmon-y pink. -
Add the flavor boosters
Stir in the minced onion, white vinegar, sugar, garlic powder, smoked paprika, salt, and black pepper.
Make sure to scrape the sides and bottom of the bowl so no spices hide in the corners. -
Taste and tweak the seasoning
Grab a clean spoon and taste a little dab.- Want more tang? Add another 1/2 teaspoon vinegar.
- Want more sweetness? Sprinkle in another 1/2 teaspoon sugar or a little extra relish.
- Want more smokiness? Add a pinch more smoked paprika.
Remember, it’ll taste a bit stronger after chilling, so don’t go too wild right away.
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Chill for best flavor
Cover the bowl tightly (plastic wrap or a reusable lid) and refrigerate for at least 30 minutes, and ideally 1–2 hours.
This resting time lets the flavors meld and the onion soften slightly, giving you that smooth, creamy burger sauce effect. -
Serve it up
Give the sauce a quick stir after chilling. Spoon it onto burgers, serve it as a fry sauce, or drizzle it over a patty melt.
If it thickened up a bit too much for your liking, thin it with 1–2 teaspoons of water or pickle juice and stir again. -
Adjust for next time
After your meal, make a quick mental note: did your family ask for “more sauce” or did they say it was “a little sweet”? Adjust your personal version next time. That’s how a copycat In-N-Out sauce becomes your house classic.
Servings & Timing
- Yield: About 1 cup of sauce (enough for 4–6 generously sauced burgers, plus dipping fries)
- Prep Time: 5–10 minutes
- Chill Time: 30–120 minutes (longer = better flavor)
- Total Time: About 35 minutes to 2 hours, mostly hands-off
Easy Variations On This Classic Burger Sauce
Want to play around a bit? Here’s where your homemade In and Out sauce really becomes your canvas.
- “Animal Style” Twist: Add 2–3 tablespoons of very finely chopped, caramelized onions and a little extra mustard for a richer, deeper animal style sauce recipe.
- Spicy Kick: Stir in 1–2 teaspoons of sriracha, hot sauce, or finely minced pickled jalapeños for a spicy, tangy burger sauce.
- Smoky BBQ Version: Swap 1 tablespoon of ketchup for 1 tablespoon of your favorite BBQ sauce to make a smoky, slightly sweeter burger condiment sauce.
- Lighter Version: Use Greek yogurt for half of the mayo and a reduced-sugar ketchup; the sauce will be a bit tangier but still creamy.
- Dill Pickle Lover’s Sauce: Use dill relish instead of sweet relish and skip the sugar for a sharper, more pickly classic burger sauce.
- Thicker Spread for Sandwiches: Add an extra tablespoon of mayo and reduce relish by 1 teaspoon for a thicker, more spreadable texture that won’t drip out of sandwiches.
Storage, Make-Ahead & Reheating (Well…There’s No Reheating)
This is a no-cook sauce, so there’s nothing to “reheat,” but storing it correctly makes a big difference in flavor and safety.
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Fridge Storage:
Store your homemade In And Out sauce in an airtight container or jar in the refrigerator. It keeps well for up to 1 week. I like using a small mason jar so it’s easy to shake before using. -
Freezer:
I don’t recommend freezing this sauce. Mayo-based sauces can separate and turn grainy when thawed, and nobody wants sad sauce. -
Make-Ahead Tips:
- Make the sauce at least a few hours before serving if you can; the flavor really comes together over time.
- For parties or meal prep, make it up to 3 days in advance, then give it a good stir or shake before serving.
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Food Safety:
Don’t leave the sauce out at room temperature for more than 2 hours. If you’re hosting an outdoor cookout on a hot day, set the bowl of sauce over a larger bowl filled with ice to keep it cool.
Notes From My Kitchen: Little Things That Make It Better
- Chop the onion tiny: If you’re using fresh onion, mince it very finely. Big chunks can be harsh; tiny bits almost melt into the sauce.
- Relish really matters: Sweet pickle relish gives that “fast food” taste. If yours is very sweet, start with 1 1/2 tablespoons and add more only if needed.
- Let it rest, seriously: I know it’s tempting to slather it on right away, but a 1–2 hour rest in the fridge turns “good” into “oh wow, this tastes just like the drive-thru sauce.”
- Use good mayo: Since mayo is the base, a better-tasting mayonnaise really does make a difference. Even my husband—who swears he “can’t tell the difference”—noticed when I used the nicer stuff.
- Taste on a fry, not just a spoon: The salt and fat from a burger or fry change how the sauce tastes, so adjust seasoning after tasting it the way you’ll actually eat it.
- Double the batch for parties: Anytime I serve this at a barbecue, people use more than I expect—especially on fries—so now I automatically double it for groups of 6 or more.
FAQs About This In And Out Sauce Recipe
1. Does this really taste like In-N-Out burger sauce?
It’s a very close copycat In-N-Out sauce with that same creamy, tangy, slightly sweet profile; fast food chains keep their exact ratios secret, but this is about as close as I’ve ever gotten at home.
2. Can I make this In and Out spread recipe without mayo?
You can use Greek yogurt or a vegan mayo, but the flavor and texture will change—still delicious, just a bit tangier or lighter than the original creamy burger sauce recipe.
3. How long does homemade In And Out sauce last in the fridge?
Stored properly in an airtight container, it’ll stay fresh for up to 1 week; always give it a quick sniff and stir before using.
4. Is this sauce gluten-free?
Yes, as long as your mayo, ketchup, and relish are gluten-free (most are, but always check your labels to be safe).
5. Can I use this fast food sauce copycat on more than burgers?
Absolutely—try it as a fry sauce, on grilled chicken sandwiches, in wraps, over veggie burgers, or as a tangy dip for onion rings and sweet potato fries.
6. My sauce is too thick—what should I do?
Stir in a teaspoon of water, pickle juice, or even a little milk at a time until it reaches your desired consistency.
7. My sauce came out too sweet—can I fix it?
Yes; add a splash more vinegar, a pinch of salt, and a little extra mustard to balance the sweetness.
8. Can I skip the onion?
You can; the sauce will still taste great. If you want a mild onion flavor without chopping, add 1/2 teaspoon onion powder instead of fresh onion.
Wrapping It Up: Your New House Burger Sauce
This In And Out Sauce Recipe takes just a few minutes, uses simple pantry ingredients, and gives you that nostalgic, classic burger sauce flavor whenever the craving hits. Once you’ve got a jar of this homemade In and Out sauce tucked in your fridge, weeknight burgers, fry nights, and even grilled chicken suddenly feel a little more fun.
If you try this copycat In-N-Out sauce, I’d love to hear how it went—tell me in the comments what you served it with and how you personalized it. And if you’re in a burger mood, don’t stop here: explore more homemade sauces and classic American burger recipes to build your own “drive-thru” at home.
In And Out Sauce (Better-Than-Drive-Thru Copycat!)
Ingredients
- 1/2 cup mayonnaise full-fat for best texture
- 3 tablespoons ketchup
- 2 tablespoons sweet pickle relish
- 1 tablespoon yellow mustard
- 1 tablespoon onion finely minced, optional but recommended
- 1 teaspoon white vinegar or apple cider vinegar
- 1 teaspoon granulated sugar
- 1/2 teaspoon garlic powder
- 1/2 teaspoon smoked paprika or regular paprika
- 1/4 teaspoon kosher salt plus more to taste
- freshly ground black pepper to taste
Instructions
- In a medium bowl, combine the mayonnaise, ketchup, sweet pickle relish, and yellow mustard. Stir until the mixture is smooth and streak-free with an even, salmon-pink color.1/2 cup mayonnaise, 3 tablespoons ketchup, 2 tablespoons sweet pickle relish, 1 tablespoon yellow mustard
- Stir in the minced onion, white vinegar, granulated sugar, garlic powder, smoked paprika, kosher salt, and black pepper. Scrape the sides and bottom of the bowl so all the spices are fully incorporated.1 tablespoon onion, 1 teaspoon white vinegar, 1 teaspoon granulated sugar, 1/2 teaspoon garlic powder, 1/2 teaspoon smoked paprika, 1/4 teaspoon kosher salt, freshly ground black pepper
- Taste the sauce with a clean spoon. For more tang, add up to another 1/2 teaspoon vinegar. For more sweetness, add up to another 1/2 teaspoon sugar or a bit more relish. For extra smokiness, add a pinch more smoked paprika. Keep in mind the flavors will intensify slightly as the sauce chills.
- Cover the bowl tightly and refrigerate the sauce for at least 30 minutes, preferably 1–2 hours, to let the flavors meld and the onion soften.
- Stir the sauce, then serve on burgers, as a fry sauce, or drizzled over patty melts, sandwiches, or roasted vegetables. If the sauce is too thick, thin it with 1–2 teaspoons of water or pickle juice and stir again.
- Transfer any leftover sauce to an airtight container or jar and refrigerate for up to 1 week. Stir or shake before serving.
