In N Out Burger Sauce Copycat Recipe: Secret Spread for Animal-Style Burgers

This copycat spread captures the exact taste of the West Coast favorite, bringing that signature flavor to your kitchen. The balanced blend of tangy and sweet creates the perfect complement to burgers and fries.

With simple ingredients and a 5-minute prep time, this sauce delivers restaurant-quality results. Store in an airtight container for up to a week.

Ingredients for In N Out Burger Sauce Copycat

Nine pantry staples transform into that iconic West Coast sauce flavor.

The mayo base is non-negotiable here—Hellmann’s or Duke’s give that perfect creamy texture. Ketchup should be the classic Heinz variety (no fancy organic stuff for this one). French’s yellow mustard is what they use in the original, and it’s the right call. White vinegar adds that signature tang, but don’t overthink the brand—any distilled kind works fine.

Need to swap something? Dijon mustard at half the amount adds a little more kick if you’re into that. No sweet relish? Dill pickle relish works in a pinch (just add an extra pinch of sugar). Want it spicier? A dash of cayenne pepper won’t hurt. The vinegar can be apple cider in a bind, but white vinegar keeps it closest to the original.

This keeps for 1 week in the fridge in an airtight container. Don’t freeze it—the texture gets weird. Make a double batch though, because once you try it, you’ll want this on everything.

Step-by-Step Instructions for In N Out Burger Sauce

Here’s how to nail that iconic spread with perfect balance every single time.

Step 1: Combine the Wet Base Ingredients

In a medium bowl, I start by whisking together the 0.5 cup Mayonnaise and 0.25 cup Ketchup until completely smooth. The mayonnaise provides that signature creamy base while the ketchup adds the classic tomato backbone that defines this sauce.

Make sure you’re using full-fat mayonnaise here—low-fat versions won’t give you that rich, velvety texture that makes the original so addictive. You’ll notice the mixture lightens slightly in color as you combine them, which is exactly what you want.

Step 2: Add the Tangy and Sweet Components

Next, I stir in the 1 tbsp Yellow Mustard, 1 tbsp White Vinegar, and 1 tbsp Sweet Relish. The mustard and vinegar add that essential tang that cuts through the richness, while the relish brings both sweetness and a subtle pickle flavor.

The vinegar’s sharpness might seem pronounced at first, but it mellows beautifully as the sauce rests. I always use white vinegar rather than apple cider here—it has the clean, bright acidity that matches the original. The relish should be finely chopped so it distributes evenly without noticeable chunks.

Step 3: Balance the Flavors with Spices

Now add the 1 tsp Granulated Sugar, 0.5 tsp Garlic Powder, 0.5 tsp Onion Powder, and 0.25 tsp Paprika. Stir thoroughly until the sugar dissolves completely and all the spices are fully incorporated. This step transforms the mixture from good to authentic.

The sugar isn’t just for sweetness—it balances the acidity from the vinegar and mustard. The garlic and onion powders add depth without overpowering, while the paprika gives that subtle smoky note that rounds out the flavor profile. I’ve found that fresh paprika makes a noticeable difference here.

Step 4: Rest and Develop the Flavors

Cover the bowl and let the sauce rest at room temperature for at least 30 minutes. This resting period allows all the flavors to meld together and the spices to fully hydrate. You’ll be amazed at how much the taste improves after just a short wait.

For the best results, I actually recommend refrigerating it for 2 hours before using. The cold helps the flavors develop even further, and the sauce will thicken slightly to that perfect spreadable consistency. Give it a good stir before using, as the ingredients may separate slightly during resting.

This makes enough for about 4 burgers, just like the original. Store any leftovers in an airtight container in the refrigerator for up to 1 week—if it lasts that long!

Storing and Reheating This Recipe

Fridge Storage

Transfer the sauce to an airtight container—I use small mason jars for easy spreading. It stays fresh in the fridge for up to 1 week. The flavors actually deepen after a day or two. ❄️

Freezing Advice

I don’t recommend freezing this sauce. The mayo can separate and develop a grainy texture when thawed. If you must, portion into ice cube trays and freeze for up to 1 month, but expect a slight change in consistency.

Room Temperature Use

Let the sauce sit at room temperature for 10-15 minutes before using if it’s been refrigerated. This makes it easier to spread and brings out the flavors more vividly.

Reheating Not Needed

This is a cold sauce, so no reheating is necessary. If it’s too thick after refrigeration, just give it a good stir. Adding a splash of cold water can help restore the perfect consistency.

Batch Prep Tips

Double the recipe if you plan to use it often—it keeps just as well. I like to make a big batch and store it in a squeeze bottle for easy application on burgers and fries.

Frequently Asked Questions