In And Out Sauce Recipe (Better Than Drive-Thru!)
If you’ve ever wished you could drizzle that iconic, tangy, creamy burger sauce over everything at home, this easy In And Out Sauce Recipe is about to make your kitchen feel like your favorite drive-thru—no long lines required.
I’m a 50-year-old mom, lifelong burger lover, and self-confessed sauce hoarder, and this copycat In and Out sauce recipe has been on steady repeat in my house for years. It’s my go-to “secret burger sauce recipe” whenever the kids come over for game day, or when my husband fires up the grill on a random Wednesday and announces, “Burgers tonight!”
This homemade In and Out sauce has that perfect balance: creamy from mayonnaise, sweet from ketchup and relish, and just enough tang from vinegar and pickles. Think classic American burger sauce turned up a notch—something between a drive-thru favorite and a backyard BBQ hero.
And yes, it absolutely works as a copycat In-N-Out burger sauce… plus it makes your fries, patty melts, and even roasted veggies taste like a special occasion.
Why You’ll Love This In And Out Sauce Recipe
- Ready in 5 minutes – No cooking, no fancy tools, just stir and chill.
- Tastes just like the real thing – That nostalgic fast food sauce copycat flavor, right at home.
- Simple pantry ingredients – Mayo, ketchup, relish… you probably have it all already.
- Versatile condiment – Use it as an In and Out spread recipe for burgers, fries, sandwiches, and wraps.
- Easily adjustable – Make it sweeter, tangier, or smokier with tiny tweaks.
- Crowd-pleasing classic – Everyone recognizes that creamy burger sauce and goes back for seconds.
- Budget-friendly – A big batch costs less than one fast-food meal.
- Perfect make-ahead sauce – Flavor actually improves after a few hours in the fridge.
Ingredients
For this classic, creamy, tangy burger sauce, you’ll need:
- 1/2 cup mayonnaise (use a full-fat, good-quality brand like Hellmann’s or Duke’s for best texture)
- 3 tablespoons ketchup (regular, not low-sugar, for that classic sweetness)
- 2 tablespoons sweet pickle relish (this adds crunch and sweetness; dill relish gives a sharper taste)
- 1 tablespoon finely minced yellow onion (or 1 teaspoon onion powder if you’re short on time)
- 1 teaspoon white vinegar (or apple cider vinegar for a softer tang)
- 1 teaspoon yellow mustard (classic hot dog-style mustard, not Dijon)
- 1/2 teaspoon sugar (just a pinch to round out the flavors)
- 1/4 teaspoon paprika (smoked paprika gives a slightly deeper flavor, but regular works great)
- 1/4 teaspoon fine sea salt, plus more to taste
- 1/8 teaspoon black pepper, freshly ground if possible
Ingredient tips from my many test batches:
- Mayonnaise: Full-fat mayo gives that thick, creamy burger sauce texture. Light mayo works, but the sauce will be a bit looser.
- Relish: If you don’t have relish, finely chop sweet pickles and add a tiny splash of the pickle juice. It tastes almost identical.
- Onion: Freshly grated or minced yellow onion gives a fantastic savory bite—just don’t overdo it or it will overpower the sauce.
- Vinegar: White vinegar tastes the closest to fast food sauces. Apple cider vinegar adds a gentle fruity note; both are delicious.
Directions
-
Mix the base.
In a medium bowl, add the mayonnaise, ketchup, and sweet pickle relish. Whisk or stir until the mixture looks smooth and uniform in color—no streaks of red or white. -
Add flavor builders.
Stir in the minced onion (or onion powder), mustard, vinegar, sugar, paprika, salt, and black pepper. Mix well, scraping the sides and bottom of the bowl so everything is fully combined. -
Taste and tweak.
Give your homemade In and Out sauce a taste. Want it sweeter like a classic American burger sauce? Add another pinch of sugar or a little more ketchup. Craving more tang? Add a few drops of vinegar at a time, stirring and tasting as you go. -
Chill for best flavor.
Cover the bowl tightly with plastic wrap (or transfer to a jar with a lid) and chill for at least 30 minutes, ideally 1–2 hours. This rest time lets the onion mellow and the flavors marry. The color will deepen slightly and the sauce thickens a bit. -
Serve it up.
Stir the sauce again before serving. Spoon it over grilled burgers, smash burgers, veggie burgers, or use it as a creamy burger sauce recipe for sliders. It’s also fantastic with fries, tater tots, onion rings, or even as a spread for turkey sandwiches. -
Adjust thickness if needed.
If your sauce thickens more than you’d like after chilling, you can loosen it with 1–2 teaspoons of water, milk, or pickle juice. Stir well until smooth and creamy again.
Servings & Timing
- Yield: About 3/4 cup sauce (enough for 4–6 burgers, depending on how saucy you like them)
- Prep Time: 5 minutes
- Chill/Rest Time: 30–120 minutes (the longer it rests, the better it tastes)
- Total Time: About 35 minutes (with 5 minutes hands-on and 30 minutes of passive chilling)
If you’re anything like my family, you might want to double the batch right away. This goes fast when there are fries involved.
Simple Reasons This Sauce Just Works
Let me explain why this particular In and Out sauce recipe hits all the right notes.
You’ve got a fatty, creamy base from the mayo that carries all the flavors. The acidity comes from both the ketchup and vinegar, giving that bright, tangy burger sauce vibe. The sweet pickle relish adds sweetness plus tiny crunchy bits, which is a huge part of that fast food sauce copycat texture.
Then the onion, paprika, and mustard step in as the “background singers”—you don’t always notice them individually, but if you leave them out, the sauce tastes suspiciously flat.
I tested versions without relish, with only onion powder, and even one with hot sauce (for research, of course). This balance right here is the one that had my grown kids saying, “Mom, this tastes like the real thing.”
Variations
Once you’ve nailed the classic copycat In-N-Out sauce, it’s fun to play a little:
- “Animal Style” Twist: Add an extra tablespoon of finely minced grilled or caramelized onions and a pinch more mustard for a richer animal style sauce recipe feel.
- Smoky BBQ Version: Stir in 1 teaspoon of your favorite BBQ sauce and a tiny pinch of smoked paprika for a backyard barbecue burger condiment sauce.
- Spicy Kick: Add 1–2 teaspoons of sriracha or a pinch of cayenne for a spicy, tangy burger sauce that’s amazing on chicken sandwiches.
- Lighter Version: Use light mayonnaise and a bit of plain Greek yogurt for a slightly leaner creamy burger sauce recipe.
- Dill Pickle Lover’s Sauce: Swap sweet relish for dill relish and reduce or skip the sugar for a more briny, tangy flavor.
- Garlic Twist: Add 1 small clove of finely minced garlic or 1/8 teaspoon garlic powder for a subtle garlicky American burger sauce.
Storage & Make-Ahead Tips
This is absolutely a make-ahead friendly sauce, which makes weeknight dinners easier.
- Refrigerator: Store your homemade In and Out sauce in an airtight jar or container in the fridge for up to 5–7 days.
- Freezer: Mayo-based sauces don’t freeze well; they can separate and turn grainy, so I don’t recommend freezing.
- Make-Ahead: For the best flavor, make this sauce at least a few hours ahead, or even the night before. It’s perfect for prepping before a cookout or party.
- Reheating/Thawing: No reheating needed—just bring the sauce out of the fridge 10–15 minutes before serving so it softens slightly and spreads easily. Give it a quick stir.
If you notice any separation after a couple of days (a thin layer of liquid at the top), just stir it well and it’ll come back together.
Notes from My Kitchen (And My Grill-Loving Husband)
- Salt at the end: Burgers and fries tend to be salty, so I always under-salt the sauce at first, then taste it with an actual bite of burger before adding more.
- Onion size matters: If you’re using fresh onion, mince it very, very finely. Big chunks are harsh and unpleasant in a smooth, creamy burger sauce.
- Chill time is not optional: I know it’s tempting to eat it right away—but that 30-minute rest really softens the onion and blends the flavors. Freshly mixed sauce tastes “ketchupy”; rested sauce tastes like fast food magic.
- Griddle burgers love this sauce: If you make smash burgers on a cast-iron skillet or griddle, spread the buns with a little butter, toast them, and then slather on this sauce. That combination is pure nostalgia.
- Great for picky eaters: My grandkids will dip just about anything in this—carrot sticks, chicken nuggets, you name it. Sometimes a familiar creamy dip is all kids need to try new foods.
You know what? I’ve even stirred a spoonful into coleslaw for a quick “burger joint slaw” on busy nights. It’s not traditional, but it tastes like something you’d get at a casual diner.
FAQs
1. Does this In And Out Sauce Recipe really taste like the original?
It’s very close—same creamy, tangy, slightly sweet flavor profile you get from an In-N-Out burger sauce, especially after chilling for at least an hour.
2. Can I make this sauce without mayonnaise?
You can use a mix of Greek yogurt and a little sour cream instead of mayo, but the texture will be tangier and less rich; still tasty, just slightly different from the classic In and Out spread recipe.
3. What’s the best way to use this sauce besides burgers?
Use it as a fast food sauce copycat dip for fries, onion rings, and nuggets, or as a sandwich spread, wrap sauce, or even a topping for baked potatoes.
4. Can I use dill relish instead of sweet relish?
Yes, but reduce or skip the added sugar and taste as you go; dill relish will make the sauce sharper and less sweet, which some people actually prefer.
5. How long should I chill the sauce before serving?
At least 30 minutes, but 1–2 hours is ideal; the flavors mellow, the onion softens, and the sauce thickens slightly.
6. My sauce is too thick—how do I fix it?
Stir in 1–2 teaspoons of water, milk, or pickle juice until it’s at the consistency you like.
7. Can I double or triple the recipe for a party?
Absolutely; this recipe scales very well—just keep the ratios the same and use a larger bowl, then store in a big jar so guests can spoon or drizzle as they like.
8. Is this sauce gluten-free?
Yes, as long as your mayonnaise, ketchup, and relish are gluten-free (most mainstream brands in the U.S. are, but always double-check labels).
Conclusion
This easy, creamy In And Out Sauce Recipe brings all the joy of a classic drive-thru burger right into your own kitchen—no traffic, no waiting, and you can put as much sauce on your burger as your heart desires. It’s simple, fast, and endlessly useful, from weeknight burgers to big family cookouts.
Give it a try, tweak it to your taste, and then come back and tell me how you used it—burgers, fries, or something totally unexpected. And if you love this kind of classic American burger sauce, you might enjoy exploring my other homemade condiment recipes next… because once you start making your own sauces, store-bought just doesn’t hit the same anymore.
In And Out Sauce Recipe (Better Than Drive-Thru!)
Ingredients
- 1/2 cup mayonnaise full-fat, good quality
- 3 tablespoons ketchup regular, not low-sugar
- 2 tablespoons sweet pickle relish
- 1 tablespoon yellow onion finely minced (or 1 teaspoon onion powder)
- 1 teaspoon white vinegar or apple cider vinegar
- 1 teaspoon yellow mustard
- 1/2 teaspoon sugar
- 1/4 teaspoon paprika
- 1/4 teaspoon fine sea salt plus more to taste
- 1/8 teaspoon black pepper freshly ground if possible
Instructions
- In a medium bowl, add the mayonnaise, ketchup, and sweet pickle relish. Whisk or stir until the mixture looks smooth and uniform in color with no streaks.1/2 cup mayonnaise, 3 tablespoons ketchup, 2 tablespoons sweet pickle relish
- Stir in the minced onion (or onion powder), mustard, vinegar, sugar, paprika, salt, and black pepper. Mix well, scraping the sides and bottom of the bowl so everything is fully combined.1 tablespoon yellow onion, 1 teaspoon white vinegar, 1 teaspoon yellow mustard, 1/2 teaspoon sugar, 1/4 teaspoon paprika, 1/4 teaspoon fine sea salt, 1/8 teaspoon black pepper
- Taste the sauce and adjust to your liking. For more sweetness, add a pinch of sugar or a little extra ketchup. For more tang, add a few drops of vinegar at a time, stirring and tasting as you go.
- Cover the bowl with plastic wrap or transfer the sauce to a jar with a lid. Chill in the refrigerator for at least 30 minutes, ideally 1–2 hours, to let the flavors meld and the onion mellow.
- Stir the sauce before serving. Use on burgers, sliders, sandwiches, wraps, or as a dip for fries, tater tots, onion rings, and veggies.
- If the sauce becomes too thick after chilling, thin it with 1–2 teaspoons of water, milk, or pickle juice, stirring until smooth and creamy.
