Brand/Copycat · dipping
In and Out Sauce
In and Out Sauce is a creamy copycat condiment that replicates the Thousand Island-style spread used at In-N-Out Burger, blending mayonnaise, ketchup, sweet pickle relish, and seasonings.
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Quick facts
Core identity, dietary fit, and storage ranges in a scannable reference table.
| Origin | No single origin is established |
|---|---|
| Base | Mayonnaise |
| Primary ingredients | mayonnaise, ketchup, sweet pickle relish, white vinegar, sugar, salt |
| Flavor profile | tangy, sweet, creamy, savory |
| Color | Pale orange-pink |
| Consistency | Medium; smooth and spreadable with small relish pieces |
| Refrigerator shelf life | 7 days |
| Freezer shelf life | Not established |
| Vegan | No |
| Gluten-free | Depends on the recipe or product |
| Dairy-free | Yes |
Dietary note
Recipes and labels vary
Check ingredient labels and individual dietary requirements; homemade and packaged versions can differ.
How it’s made
Mayonnaise, ketchup, and sweet pickle relish are whisked together with a small amount of white vinegar and sugar. The mixture is seasoned with salt and refrigerated briefly to allow the flavors to meld before serving.
In and Out Sauce recipe
Mayonnaise, ketchup, and sweet pickle relish are whisked together with a small amount of white vinegar and sugar. The mixture is seasoned with salt and refrigerated briefly to allow the flavors to meld before serving.
Ingredients
- 1/2 cup mayonnaise
- 2 tablespoons ketchup
- 2 tablespoons sweet pickle relish
- 1 teaspoon white vinegar
- 1/2 teaspoon granulated sugar
- 1/4 teaspoon salt
Method
- Combine mayonnaise, ketchup, and sweet pickle relish in a small bowl.
- Add white vinegar, sugar, and salt.
- Whisk until smooth and evenly combined.
- Cover and refrigerate for at least 15 minutes before serving to allow flavors to meld.
Common uses
Practical applications with the role this sauce plays in each dish.
Use 01
Burger spread
Applied to burger buns as a creamy, tangy condiment in place of plain mayo or ketchup.
Use 02
French fry dip
Served alongside fries as a richer alternative to plain ketchup.
Use 03
Sandwich spread
Used on grilled chicken or deli sandwiches to add moisture and tangy flavor.
Use 04
Veggie dip
Paired with raw vegetables such as carrots, celery, and bell pepper strips.
Use 05
Onion ring dip
Used as a dipping sauce for fried onion rings, complementing their savory crunch.
Use 06
Wrap condiment
Spread inside wraps or burritos to add creaminess and mild sweetness.
Use 07
Slider sauce
Dolloped onto sliders or mini burgers for a fast-food-style flavor profile.
Pairings
Pairing ideas grouped by food role for quick comparison.
Proteins
- beef burgers
- grilled chicken
- turkey burgers
- hot dogs
Vegetables
- iceberg lettuce
- tomato slices
- raw carrots
- bell pepper strips
Carbs
- brioche buns
- potato fries
- onion rings
- slider rolls
In and Out Sauce substitutes
Starting ratios, best uses, and the main functional tradeoff for each alternative.
| Substitute | Ratio | Best for | Notes |
|---|---|---|---|
| Thousand Island dressing | 1:1 | Burger spread or dip | Closest flavor match; may be slightly thinner and sweeter. |
| Russian dressing | 1:1 | Burger spread | Tangier and spicier; omit added sugar when substituting. |
| Big Mac sauce (homemade) | 1:1 | Burger spread | Similar base; adds mustard and onion powder notes. |
| Fry sauce (mayo-ketchup blend) | 1:1 | Dipping fries | Simpler flavor; lacks relish sweetness. |
| Comeback sauce | 1:1 | Dipping or spreading | Adds chili sauce and hot sauce; noticeably spicier result. |
Storage
Keep time and temperature guidance visible, and discard sauce when spoilage signs appear.
Refrigerator
Store in an airtight container for up to 7 days. Keep at or below 40°F. Stir before each use as slight separation may occur.
Freezer
Freezing is not recommended. Mayonnaise-based sauces separate upon thawing, resulting in an unpleasant texture.
Signs of spoilage
Discard if the sauce develops an off odor, visible mold, or a watery layer that does not reincorporate after stirring.
In and Out Sauce FAQ
Short, self-contained answers to common questions.
What does In and Out Sauce taste like?
It tastes creamy and tangy with a mild sweetness from sweet pickle relish and a slight acidity from ketchup and vinegar. The overall flavor is similar to Thousand Island dressing but slightly simpler and less sweet.
Is In and Out Sauce the same as Thousand Island dressing?
They are closely related but not identical. Thousand Island dressing typically includes hard-boiled egg and additional ingredients. In and Out Sauce copycat recipes use a simpler base of mayonnaise, ketchup, and sweet pickle relish without egg.
Is In and Out Sauce gluten-free?
It depends on the specific brands used. Mayonnaise and ketchup are generally gluten-free, but some pickle relishes or ketchup brands may contain additives. Check individual product labels if gluten sensitivity is a concern.
How long does homemade In and Out Sauce last?
Stored in an airtight container in the refrigerator at or below 40°F, homemade In and Out Sauce keeps for up to 7 days. Discard it sooner if it develops an off odor or visible spoilage.
Can I make In and Out Sauce without mayonnaise?
Yes. Vegan mayonnaise substitutes work in a 1:1 ratio and produce a similar texture and flavor. Greek yogurt can replace mayo for a tangier, lower-fat version, though the consistency will be thinner.