Have you ever taken a bite of a burger and thought it needed one more thing? That creamy, tangy, slightly sweet sauce can make a simple burger taste extra special. If you love the famous sauce served with In-N-Out-style burgers, you can make a tasty copycat version right in your own kitchen. You do not need fancy ingredients or special cooking skills. In fact, this sauce comes together in just a few minutes.
The best part is that you can keep a small jar in your fridge and use it whenever a burger or fries craving hits. The sauce is creamy, smooth, sweet, tangy, and full of flavor. Once you try it, plain burgers may never feel quite the same again.
What Is This Recipe?
This In-N-Out sauce recipe is a simple homemade copycat sauce inspired by the creamy spread used with In-N-Out-style burgers and fries. It combines mayonnaise, ketchup, sweet pickle relish, vinegar, and a few seasonings.
The result is a thick and creamy sauce with a nice balance of sweet, tangy, and savory flavors. You can spread it on burgers, dip fries into it, or use it as a sandwich spread.
It takes only a few minutes to mix, but chilling it before serving makes the flavor even better.
Why You Will Love This Recipe
- Quick to make: You can mix the sauce in about 5 minutes with no cooking.
- Big flavor: The creamy base blends with sweet relish and tangy vinegar for a rich taste.
- Budget-friendly: A few common pantry ingredients make a useful batch of sauce.
- Easy to customize: You can make it sweeter, tangier, or more savory.
- Great for many foods: Use it on burgers, fries, sandwiches, wraps, and even roasted potatoes.
- Perfect for meal prep: Keep it chilled and ready for quick meals during the week.
Here’s where most people get this wrong: they serve the sauce immediately. It tastes good right away, but a short rest in the refrigerator helps the flavors blend together.
Ingredients
- 1/2 cup mayonnaise: This creates the smooth, creamy base. Use regular mayonnaise for a rich texture, or light mayonnaise for a lighter option.
- 3 tablespoons ketchup: Ketchup adds sweetness, tomato flavor, and a beautiful pink color.
- 2 tablespoons sweet pickle relish: This is important for the classic sweet and tangy taste. Finely chopped sweet pickles can work if you do not have relish.
- 1 tablespoon white vinegar: Vinegar adds brightness and keeps the sauce from tasting too heavy.
- 1/2 teaspoon granulated sugar: A small amount helps balance the tangy ingredients.
- 1/4 teaspoon onion powder: This gives the sauce a gentle savory flavor without adding large pieces of onion.
- 1/4 teaspoon garlic powder: Just a little adds extra depth.
- 1/8 teaspoon salt: Add enough to bring all the flavors together without making the sauce salty.
For the best texture, finely chop any large pieces of pickle relish. You want the finished sauce to be creamy and easy to spread.
How to Make In-N-Out Sauce
1. Add the creamy ingredients
Start by placing the mayonnaise and ketchup in a small mixing bowl. Use a clean spoon or small whisk to combine them slowly. At first, you may see white and red streaks, but keep mixing until the color becomes smooth and even.
The mixture should look creamy and slightly pink. Scrape the sides of the bowl so none of the mayonnaise stays unmixed. A smaller bowl works well because it makes mixing easier.
Do not rush this step. A smooth base gives you a better finished sauce.
2. Add the pickle relish
Next, add the sweet pickle relish to the creamy mixture. Stir it in gently so the tiny pickle pieces spread throughout the sauce.
You should notice a little texture while the sauce remains thick and smooth. If your relish contains large pieces, chop them first for a more restaurant-style spread.
The relish adds both sweetness and a mild pickle flavor. It is one of the ingredients that gives this sauce its special character.
3. Add vinegar and seasonings
Pour in the white vinegar, then add the sugar, onion powder, garlic powder, and salt. Stir everything together until the sauce looks completely blended.
Taste a tiny amount and decide what it needs. If you want more tang, add a few drops of vinegar. If you prefer a sweeter sauce, add a small pinch of sugar.
Avoid adding too much at once. Small changes are easier to control.
4. Chill before serving
Cover the bowl and place the sauce in the refrigerator for at least 30 minutes. If you have more time, letting it rest for an hour gives the flavors even more time to blend.
After chilling, stir the sauce once more. It should be thick, creamy, and easy to spread.
If the sauce seems too thick, add a tiny amount of water and stir well. Do not add too much because you want the sauce to stay rich and creamy.
This small trick makes a huge difference: letting the sauce rest before serving gives the sweet, tangy, and savory flavors time to come together.
Pro Tips
- Use full-fat mayonnaise for a richer sauce. Its creamy texture makes the finished spread thick and smooth.
- Finely chop the relish if needed. Smaller pieces make the sauce easier to spread on a burger.
- Taste before adding more seasoning. The ketchup and relish already contain flavor, so you may need less salt than expected.
- Do not overdo the vinegar. A little gives the sauce brightness, while too much can make it sharp.
- Chill the sauce before serving. This is one of the easiest ways to improve the final flavor.
- Make a double batch for parties. Burgers and fries can disappear quickly when this sauce is on the table.
- Use a clean spoon every time. This helps keep the refrigerated sauce fresh for longer.
- Keep the sauce thick. A thick sauce stays on burgers and sandwiches instead of running off.
- Adjust it to your taste. More relish makes it sweeter and pickle-forward, while a little extra vinegar makes it tangier.
- Make it ahead. Preparing the sauce a few hours before dinner can make your meal feel much easier.
Common Mistakes to Avoid
- Using too much vinegar: This can make the sauce sour instead of balanced.
- Skipping the relish: Without it, the sauce may lose its sweet pickle flavor.
- Adding too much sugar: Too much sweetness can hide the savory flavors.
- Not mixing well: Uneven mixing can leave strong pockets of seasoning.
- Using large pickle pieces: Big pieces can make the sauce harder to spread.
- Serving immediately: The sauce can taste better after chilling.
- Adding too much salt: Ketchup and relish may already contain salt.
- Making it too thin: Too much liquid can turn the sauce runny.
- Using old mayonnaise: Fresh ingredients give the sauce a cleaner flavor.
- Leaving it uncovered: The sauce can pick up refrigerator smells.
- Using a dirty spoon: This can introduce unwanted bacteria into the sauce.
- Adding all adjustments at once: Change one ingredient at a time so you can control the flavor.
Variations and Customization Ideas
Quick version: Mix the main ingredients together and serve immediately when you are short on time.
Spicy version: Add a pinch of cayenne pepper or a little hot sauce for extra heat.
Garlic version: Add a little extra garlic powder for a stronger savory flavor.
Tangy version: Add a few extra drops of vinegar for a sharper taste.
Sweeter version: Add a tiny amount of extra sugar if you prefer a sweeter sauce.
Lighter version: Use light mayonnaise to reduce the richness.
Vegan version: Use vegan mayonnaise and check that your other ingredients are vegan-friendly.
High-protein meal idea: Pair the sauce with a lean chicken or turkey burger and plenty of fresh vegetables.
Now let’s make it even better…
Serving Ideas
Spread this sauce over a hot cheeseburger with lettuce, tomato, and onion. It also makes a fantastic dip for crispy French fries, potato wedges, onion rings, and roasted potatoes.
Try it on chicken sandwiches, wraps, turkey burgers, or grilled vegetables. You can even serve a small bowl beside a plate of homemade fries for dipping.
For a fun snack, use it as a dip for crispy chicken tenders. The creamy texture pairs especially well with crunchy foods.
Storage & Reheating
Place leftover sauce in a clean, airtight container and keep it refrigerated.
Because this sauce contains mayonnaise, pickle relish, and other perishable ingredients, keep it cold and follow the storage guidance on your ingredient labels. For best quality, use homemade sauce within about 3–4 days.
There is no need to reheat this sauce. Simply take it from the refrigerator, stir it well, and serve. Do not leave it sitting at room temperature for long periods, especially during warm weather.
Nutrition Facts
Approximate nutrition per 2-tablespoon serving:
- Calories: 120–140
- Fat: 12–14g
- Carbohydrates: 3–5g
- Protein: Less than 1g
- Sugar: 2–3g
- Sodium: Varies by ingredients
Nutrition can change depending on the mayonnaise, ketchup, relish, and serving size you use.
Quick Summary
- Mix mayonnaise and ketchup.
- Add sweet pickle relish.
- Stir in vinegar and seasonings.
- Mix until creamy and smooth.
- Chill for at least 30 minutes.
- Taste and adjust if needed.
- Serve with burgers, fries, sandwiches, or wraps.
- Store leftovers in an airtight container in the refrigerator.
When to Eat This
This sauce is perfect whenever you want a quick flavor boost without making a complicated recipe.
Use it for a busy morning breakfast sandwich when you want something creamy and flavorful. Add it to lunch wraps when plain sandwiches feel boring. Serve it with burgers and fries for a relaxed family dinner.
It is also great for snack cravings, especially with crispy fries or chicken tenders. And when late-night hunger hits, a quick sandwich with this creamy sauce can feel much more satisfying.
Once you have a jar ready in the fridge, you may find yourself looking for new foods to dip into it. That is the fun part—one simple sauce can turn an ordinary meal into something you actually look forward to eating.