In-N-Out sauce, the iconic "spread" on their burgers and fries, is a creamy, tangy condiment that's easy to recreate at home with pantry staples. This copycat version captures its Thousand Island-like flavor profile based on popular recipes shared across food blogs and sites.

Core Ingredients

Most copycat recipes converge on these essentials for about 1 cup of sauce:

  • 1/2 to 1 cup mayonnaise (Hellmann's or Best Foods recommended for authenticity).
  • 1/3 cup ketchup (Heinz for best results).
  • 2-4 tbsp sweet pickle relish (adds crucial texture and sweetness).
  • 1-2 tbsp white vinegar (for tang).
  • 1/2-1 tsp sugar or honey (balances acidity).

Optional tweaks appear in variations: a pinch of salt, pepper, yellow mustard, or ground mustard for depth.

Step-by-Step Recipe

Follow this reliable method, yielding enough for 4-6 burgers (prep: 5 minutes, chill: 30+ minutes).

  1. Prep the base : In a small bowl, whisk vinegar, sugar, salt (1/2 tsp kosher), and ground mustard (1/4 tsp) until dissolved—this prevents graininess.
  1. Combine : Add mayonnaise, ketchup, and relish. Stir vigorously until smooth and uniform.
  1. Rest : Cover and refrigerate 30-60 minutes (or overnight) for flavors to meld—essential for that authentic taste.
  1. Serve : Slather on burgers, dip fries, or use as a sandwich spread. Stores in fridge up to 1 week.

Variation| Key Twist| Best For
---|---|---
Classic 19| Mayo, ketchup, relish, vinegar, sugar| Everyday burgers
Mustard Boost 57| Add ground/yellow mustard| Tangier fries
Spicy 4| Cayenne or hot sauce| Heat lovers
Sweeter 3| Extra sugar/honey| Kid-friendly

Why It Works

In-N-Out keeps the official recipe secret, fueling decades of home experiments—fans swear by these ratios for nailing the creamy, pickle-forward vibe without preservatives. Pro tip: Use full-fat mayo for richness; lite versions work but dilute flavor.

Trending Twists (2025-2026)

Recent forums buzz about vegan swaps (aquafaba mayo) and air-fryer hacks pairing it with animal-style fries. Foodies on sites like Reddit tweak for low-carb diets, subbing sugar for stevia.

TL;DR : Mix mayo-ketchup-relish base with vinegar-sugar, chill, and enjoy—spot-on copycat in minutes.

Information gathered from public forums or data available on the internet and portrayed here.