Copycat In-N-Out Sauce Recipe

This Copycat In-N-Out Sauce Recipe is one of those little kitchen wins that feels way bigger than it should. I’m Linda Sandra — a Charleston home cook who believes every meal should feel like a hug — and this homemade spread is pure pantry magic.

You’re five minutes away from the creamy, tangy, slightly sweet sauce that makes In-N-Out burgers so iconic. And yes, it tastes just like the real thing.

If you’ve never had the famous In-N-Out spread, think Thousand Island’s cooler, tangier cousin. It hits that perfect sweet-savory balance that makes you want to put it on literally everything.

Burger nights at home just got a serious upgrade. Let’s make it!

Little Snapshot: What This Recipe Delivers

This Copycat In-N-Out Sauce Recipe is a 5-minute, no-cook condiment made with mayonnaise, ketchup, sweet pickle relish, yellow mustard, and white vinegar.

It delivers that signature creamy, tangy, slightly sweet flavor from the restaurant — right from your own fridge. Perfect as a burger spread, fry dip, or sandwich topper for any night of the week.

Nutritional Peek

Here’s an approximate nutritional breakdown per serving (1 tablespoon) of this Innout Sauce Recipe:

Nutrient	Amount Per Serving
Calories	~90 kcal
Protein	0.2 g
Carbohydrates	3 g
Fat	9 g
Fiber	0.1 g
Sugar	2 g
Sodium	~180 mg

Using reduced-fat mayo cuts the calories nearly in half without sacrificing that creamy texture we all love.

Ingredients

This Homemade In N Out Sauce keeps things beautifully simple. For the creamy base, you’ll need mayonnaise (reduced-fat or regular both work great). For the flavor layer, you’ll reach for ketchup, yellow mustard, white vinegar, and sweet pickle relish. Salt and pepper round everything out.

Amount	Ingredient
1/2 cup	Mayonnaise (reduced-fat or regular)
3 tablespoons	Ketchup
1 teaspoon	Yellow mustard
1 teaspoon	White vinegar
2 1/2 tablespoons	Sweet pickle relish
1 dash	Salt
1 dash	Black pepper

Tools You’ll Actually Use

• Medium mixing bowl
• Whisk or fork
• Measuring spoons and cups
• Plastic wrap or bowl cover
• Airtight jar or container (for storing)

Step-by-Step Instructions for This Copycat In-N-Out Sauce Recipe

Making this Copycat In-N-Out Sauce Recipe is almost embarrassingly easy. Here’s exactly how to do it:

Step 1 — Combine the ingredients. Add the 1/2 cup mayonnaise, 3 tablespoons ketchup, 1 teaspoon yellow mustard, 1 teaspoon white vinegar, and 2 1/2 tablespoons sweet pickle relish into a medium bowl.

Step 2 — Season. Add a dash of salt and a dash of black pepper to the bowl.

Step 3 — Whisk. Use a whisk or fork to mix everything together until the sauce is fully combined, smooth, and creamy. It should look like a blush-pink, glossy spread.

Step 4 — Chill. Cover the bowl with plastic wrap and refrigerate for at least 30 minutes. This is where the magic happens — the flavors meld and deepen beautifully.

Step 5 — Serve and enjoy! Spread it on burgers, dip your fries, or drizzle it over anything your heart desires.

Pro Tips for the Best Innout Sauce

A few tips from my kitchen to yours — because even the simplest recipes have their little secrets.

Don’t skip the chill time. Thirty minutes in the fridge makes a genuine difference. The flavors settle and marry together in a way that makes the sauce taste more complex and less “just mixed.” If you can make it a day ahead, even better.

Use good-quality mayo. Since mayo is the base of this entire sauce, quality matters. A rich, full-fat mayo gives you the creamiest result, but reduced-fat works perfectly too if you’re watching calories.

Taste before you serve. Everyone’s palate is a little different. Want it tangier? Add a tiny splash more vinegar. Prefer it sweeter? A pinch more relish does the trick. Make it yours.

Quick Fixes for Your Copycat In-N-Out Sauce Recipe

The sauce is too thin. Add a little more mayonnaise, one teaspoon at a time, until you reach your preferred consistency. Chill it again briefly — cold sauce always thickens up nicely.

The sauce tastes too sweet. Add a tiny extra splash of white vinegar (start with 1/4 teaspoon) and a pinch of salt. Taste and adjust from there — the vinegar cuts through the sweetness quickly.

The sauce is too tangy. Stir in a little more sweet pickle relish or a tiny pinch of sugar. Even a small amount smooths out an overly tangy sauce right away.

It doesn’t taste like the restaurant version. The chilling step is usually the culprit. Freshly mixed sauce tastes flat — give it the full 30 minutes (or overnight!) and you’ll notice a big difference.

Variations and Adaptations

This Innout Sauce is incredibly flexible. Here are some fun ways to make it your own:

• Lighter version: Use reduced-fat mayo and low-sugar ketchup to cut calories without losing flavor.
• Spicy kick: Add a dash of hot sauce, a pinch of cayenne, or a few red pepper flakes for heat.
• Smoky twist: Stir in a small pinch of smoked paprika or a drop of liquid smoke for a grilled-flavor vibe.
• Garlic lover’s version: Add 1/4 teaspoon garlic powder or a tiny bit of finely minced fresh garlic.
• Greek yogurt swap: Replace the mayo with plain Greek yogurt for a tangier, protein-rich alternative.

Serving, Storage, and Reheating

This Homemade In N Out Sauce is incredibly versatile at the table. Spread it on burgers and cheeseburgers, use it as a dip for fries, onion rings, or chicken tenders, drizzle it over a burger bowl, or even toss it into a pasta salad as a tangy dressing base.

It also pairs beautifully as a dipping sauce alongside our festive Memorial Day fruit salsa and cinnamon chips for a fun party spread.

Store your sauce in an airtight container or jar in the refrigerator for up to one week. Keep it covered and always use a clean utensil to avoid contamination. Do not leave it at room temperature for more than two hours.

This sauce is best served cold — no reheating needed. Give it a quick stir before serving if it has been stored for a few days, and it will be good as new.

No-Waste Kitchen Magic

Made a big batch and not sure what to do with the extras? Here are some creative ideas so nothing goes to waste.

• Use leftover sauce as a marinade for chicken breasts — place chicken in a zip-lock bag with a few spoonfuls and refrigerate overnight before grilling or baking.
• Stir a dollop into scrambled eggs or spoon it over a fried egg for a savory breakfast twist.
• Mix into mashed potatoes or drizzle over baked potatoes for something unexpectedly delicious.
• Use as a spread on a grilled cheese sandwich in place of butter — trust me on this one.

FAQs About This Copycat In-N-Out Sauce Recipe

Final Thoughts

This Copycat In-N-Out Sauce Recipe is one of those recipes that earns a permanent spot in your fridge. It is quick, it is easy, and it genuinely tastes like the real thing.

Whether you are slathering it on a weekend burger or sneaking spoonfuls while dipping fries, this homemade spread just makes everything better.

I would love to see your spin on this Copycat In-N-Out Sauce Recipe! Drop a comment below with your photos and your favorite ways to use it. Did you go spicy? Garlic-y? Tell me everything — I am all ears and absolutely here for your sauce creativity.

So there you go — Homemade In N Out Sauce that feels fancy but is secretly just five ingredients and a whisk. You’ve totally got this.

I’m Linda Sandra — a Charleston home chef and comfort-food daydreamer. Around here, cooking is not about perfection — it’s about cozy vibes, creative twists, and food that feels like love.