In N Out Animal Sauce Recipe: Secret Menu Spread for Burgers and Fries

This sauce delivers the signature secret menu flavor that In-N-Out fans crave. A creamy, tangy spread that elevates burgers and fries to new heights.

With just a few simple ingredients, you can recreate this iconic condiment at home. The balance of flavors is what makes it so addictive.

Ingredients for In N Out Animal Sauce

A handful of pantry staples blends into this iconic creamy spread for burgers.

The mayonnaise base is non-negotiable for that signature creaminess—Hellmann’s or Duke’s are the gold standard here. Most grocery stores carry them, but check the refrigerated section for the freshest batches. For the relish, Heinz or Vlasic sweet pickle relish works perfectly (avoid dill relish—it throws off the flavor profile). The ketchup should be standard Heinz or Hunts for consistent sweetness.

No mayonnaise? Vegan mayo at a 1:1 ratio works in a pinch, though the flavor won’t be identical. Swap sweet relish for finely chopped bread and butter pickles if needed. The vinegar can be apple cider vinegar if that’s what you have. Want more tang? Add an extra teaspoon of mustard. The dried onion is key—don’t substitute fresh (it’ll make the sauce watery).

This keeps 5-7 days in the fridge in an airtight container. The flavors meld and intensify over time, so it actually tastes better after 24 hours. Doesn’t freeze well—make fresh batches for best texture and flavor.

Step-by-Step Instructions for Animal Sauce

Combine all ingredients in the right order for that signature creamy, tangy flavor.

Step 1: Mix Mayonnaise with Ketchup and Mustard

In a medium bowl, combine the 0.5 cup Mayonnaise, 2 tbsp Ketchup, and 2 tbsp Yellow Mustard. Use a whisk to blend until smooth and uniform in color. This base creates the creamy, rich foundation that defines the sauce.

The mayonnaise should be full-fat for the best texture. You’ll notice the mixture lighten slightly as the ingredients emulsify. Stop mixing once no streaks remain.

Step 2: Incorporate Sweet and Acidic Elements

Add the 1 tbsp Sweet Relish, 1 tsp White Vinegar, and 1 tsp Granulated Sugar to the bowl. Whisk again until fully integrated. The relish adds subtle sweetness and texture, while the vinegar balances the richness with a touch of acidity.

The sugar ensures the tangy and sweet flavors harmonize. If the relish contains visible pickle pieces, they’ll soften slightly as they sit in the sauce.

Step 3: Season with Spices and Onion

Sprinkle in the 1 tsp Dried Minced Onion, 0.25 tsp Paprika, 0.25 tsp Garlic Powder, and 0.25 tsp Salt. Stir well to distribute the spices evenly. The dried minced onion rehydrates slightly, adding a mild savory note without overpowering the sauce.

The paprika contributes a hint of smokiness, while the garlic powder deepens the flavor profile. Taste at this stage—if needed, add a pinch more salt, but the original amount is typically perfect.

Step 4: Rest and Chill for Optimal Flavor

Cover the bowl and refrigerate for at least 30 minutes. This resting period allows the flavors to meld together, transforming the mixture from a simple blend into the well-rounded sauce you expect.

After chilling, give it a quick stir before using. The sauce will thicken slightly as it cools, making it ideal for spreading on burgers or dipping fries.

Make-Ahead Tips for Leftovers

Prep Ahead for Parties

This sauce tastes even better after 24 hours in the fridge. I always make it the day before gatherings so the flavors can fully develop. The dried minced onion softens and blends seamlessly into the creamy base. 💡

Portion for Burgers

For easy assembly, scoop 2 tablespoons portions onto parchment paper, then freeze on a tray. Once solid, transfer to a freezer bag. Thaw in the fridge 2-3 hours before using for perfectly spreadable patties.

Dip Station Setup

Serve in small mason jars with lids for a cute presentation. Label with the date since it keeps for 5-7 days refrigerated. I use 4 oz jars for individual servings at BBQs.

Double Batch Tip

Simply double all ingredients if making a larger quantity. Use a large bowl and whisk vigorously to maintain the creamy texture. Store in an airtight container to preserve freshness.

Last-Minute Fix

If the sauce separates after refrigeration, just give it a quick whisk. The emulsification restores immediately. I’ve never had it fail even after 5 days in the fridge. ❄️

Travel-Friendly

Pack in leak-proof containers for picnics. The thick consistency prevents spills. I bring it in Sistema containers—they’re unbreakable and seal tightly.

Frequently Asked Questions