Homemade In N Out Sauce (Exact Copycat!) (VIDEO)
This post may contain affiliate links. Please read our disclosure policy.
Make the famous In N Out Sauce at home – all you need is 7 ingredients and 5 minutes to whip this beloved creamy, savory sauce at home!
Watch the In N Out Sauce Recipe Video!
A Note from CJ
Homemade In N Out Sauce is better!
I started developing sauce recipes when I realized they always taste better homemade (and it’s so much easier than you think!) I’ve tested this multiple times to get it as close as possible to the infamous In N Out Sauce (including calling them multiple times, lol!)
Try other homemade sauces like my Ranch, Raising Cane’s Sauce, Wingstop Ranch, Chick Fil A Sauce, Tonkatsu Sauce, BBQ sauce, Sweet and Sour Sauce, Thai Sweet Chili Sauce, and Popeye’s Blackened Ranch!
Ingredient Tips
Refer to the recipe card for the full list of ingredients and measurements!
- ground mustard: sometimes labeled powdered mustard. I recommend using ground mustard over yellow mustard, as yellow mustard has other ingredients (like water and vinegar).
- ketchup: I tested with multiple brands and Heinz works best.
- mayo: I tested with multiple brands and Best Foods/Hellman’s works best.
- sugar + sweet relish: In N Out spread is balanced in being both savory and sweet – that’s why you’ll see two sources of sugar in this recipe. If you prefer less sweet sauces, you can reduce the sugar or use a non-sweet relish.
How to Make In N Out Spread
Mix Vinegar, Sugar, Ground Mustard, and Salt – In a small mixing bowl, mix together distilled white vinegar, sugar, ground mustard, and salt. Mix well until the sugar, mustard, and salt have dissolved.
Add Remaining Ingredients and Let Sit for 10 Minutes – To the same bowl, add mayonnaise, ketchup, and relish. Mix together and let sit for 10 minutes to allow the flavors to meld. Store in the fridge for up to 1 week.
PRO TIPS
CJ’s Recipe & Storage Tips
- Mix the the sugar, ground mustard and salt into the vinegear until dissolved first – these are the ingredient smost suseptible to clumping, so I like to dissolve them into the vinegar first.
- Sauces always taste better as the flavors meld together! Let this sit for at least 10 minutes but as long as possible (covered, in the refrigerator) for the best results.
- You can store this in an airtight container in the refrigerator for up to 1 week. Do not leave it outside in room temperature – it will spoil! Make sure to use a clean utensil every time to avoid contamination.
If you tried this In N Out Sauce Recipe or any other recipe on my website, please leave a 🌟 star rating and let me know how it went in the comments below!
In N Out Sauce (Perfect Copycat)
Ingredients
- 2 tbsp distilled white vinegar
- 1/2 tsp sugar
- ¼ tsp ground mustard
- ½ tsp kosher salt
- 1 cup mayonnaise, use Best Foods/Hellmann’s Mayonnaise
- 1/3 cup ketchup, Heinz is best
- 2 tbsp sweet pickle relish
Instructions
- In a small mixing bowl, mix together distilled white vinegar, sugar, ground mustard, and salt. Mix well until the sugar, mustard, and salt have dissolved.
- To the same bowl, add mayonnaise, ketchup, and relish. Mix together and let sit for 10 minutes to allow the flavors to meld. Store in the fridge for up to 1 week.
Video
Notes
Nutrition
Nutrition information is automatically calculated, so should only be used as an approximation.
This In N Out Sauce recipe was originally published in June 2025, and updated in November 2025.
Super yummy and easy to make!
Thanks so much, Ellie!