Cutting carbs doesn’t mean giving up a good burger sauce, and this recipe is proof of that.
It’s the same creamy, tangy, slightly sweet flavor you love from the original copycat version, just made with sugar-free swaps so it fits into a low-carb or keto lifestyle without sacrificing taste. Five minutes, a handful of ingredients, and a sauce that tastes just as good as the full-sugar version.
If you’ve been missing that classic burger sauce flavor since going low-carb, this fixes that. 🥬
Why This Sauce Works So Well
Swapping regular sugar for a keto-friendly sweetener keeps that familiar hint of sweetness without adding any actual sugar or carbs to the mix.
Using a sugar-free relish, or finely chopped dill pickles with a bit of sweetener, gives you that same little burst of texture and tang the original relies on.
And the base of mayonnaise, mustard, and spices stays essentially the same, since those ingredients were already naturally low in carbs to begin with.
What You’ll Need
- 1/2 cup mayonnaise (check the label for added sugar)
- 2 tablespoons sugar-free relish (or finely chopped dill pickles with a pinch of sweetener)
- 1 tablespoon yellow mustard
- 1 teaspoon white vinegar
- 1/2 teaspoon keto-friendly sweetener (like erythritol or monk fruit)
- 1/2 teaspoon garlic powder
- 1/2 teaspoon smoked paprika
Seven ingredients, and most of the swaps are simple substitutions from the classic version.
Tools You’ll Need
- A small mixing bowl
- A whisk or spoon
- A jar or airtight container for storing
That’s genuinely the whole list.
How to Make Keto Big Mac Sauce
- Add the mayonnaise, sugar-free relish, mustard, vinegar, sweetener, garlic powder, and smoked paprika to a small bowl.
- Whisk everything together until fully combined and smooth.
- Taste and adjust seasoning as needed, adding a touch more sweetener or vinegar to match your preference.
- Cover and refrigerate for at least 30 minutes before serving, letting the flavors meld together.
- Store in an airtight container or jar until ready to use.
Five steps, and the fridge does most of the actual work from here.
Pro Tips From Making the Low-Carb Version Often
Check your mayonnaise label. Some brands sneak in added sugar, so choosing one without it keeps this sauce fully keto-friendly.
Use a granulated sweetener that dissolves well. Erythritol and monk fruit blends tend to mix smoothly into sauces without leaving a gritty texture behind.
Let it chill before serving. Just like the original, this sauce tastes noticeably better after sitting in the fridge for at least 30 minutes.
Finely chop your pickles if using them instead of relish. Smaller pieces distribute more evenly throughout the sauce.
Taste as you go. Sugar substitutes vary in sweetness intensity, so add gradually and adjust based on the specific one you’re using.
Substitutions and Variations
| Swap this | For this |
|---|---|
| Regular mayonnaise | Avocado oil mayonnaise for an even cleaner ingredient list |
| Sugar-free relish | Finely chopped dill pickles with a pinch of sweetener |
| Erythritol or monk fruit | Allulose, another keto-friendly sweetener option |
| Yellow mustard | Dijon mustard for a sharper flavor |
| Smoked paprika | Regular paprika (less smoky) |
You can also add a small pinch of cayenne if you’d like a bit of heat mixed into the sauce.
Make Ahead Tips
This sauce is genuinely better made ahead, since the flavors need a bit of time in the fridge to fully come together.
Make a batch up to a week in advance and store it in an airtight container, so it’s ready whenever a burger craving hits.
A Few Extra Details Worth Knowing
Nutrition-wise, a 2-tablespoon serving lands around 90 to 100 calories, with minimal net carbs thanks to the sugar-free ingredients.
For different diets:
- Keto and low-carb: this recipe is designed specifically to fit these lifestyles
- Gluten-free: this recipe is naturally gluten-free as written
- Dairy-free: this recipe is naturally dairy-free as written
Pairing suggestions: this sauce works great on lettuce-wrapped burgers, as a dip for keto-friendly fries made from radishes or turnips, or drizzled over a burger bowl.
Time-saving tip: make a double batch since it keeps well, so you’re not remaking it every time you want a burger.
Leftovers and Storage
Store in an airtight container in the fridge for up to 1 week.
Give it a quick stir before each use, since the ingredients can settle slightly as it sits.
FAQ
Does this taste different from the regular version?
It’s very close, with the main difference being the type of sweetness. Sugar substitutes can have a slightly different aftertaste depending on the brand, so it’s worth trying a couple to find your favorite.
Is this sauce truly keto-friendly?
Yes, as long as you use a mayonnaise without added sugar and a keto-approved sweetener, this sauce fits well within a low-carb or keto diet.
Can I use this on more than just burgers?
Definitely. It works well as a dip for low-carb vegetables, a spread on lettuce wraps, or drizzled over a burger bowl or salad.
What’s the best sweetener to use here?
Erythritol and monk fruit blends tend to work well in savory sauces like this one, dissolving smoothly without leaving a strong aftertaste.
Can I freeze this sauce?
Mayonnaise-based sauces don’t freeze well, since they tend to separate once thawed, so it’s best kept in the fridge and used within the week.
Wrapping Up
This sauce proves that eating low-carb doesn’t mean missing out on the flavors you actually crave.
A quick whisk, a short chill, and a sauce that brings that same classic burger flavor without any of the added sugar.
Make a batch this week and let me know how it turns out in the comments. I’d love to hear what sweetener you used, and if you have any questions along the way, just ask. I read every comment.
