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This recipe for sugar-free keto tomato sauce is full of flavor and can be used in so many recipes. All while only using 5 ingredients!

keto tomato sauce in glass jar

While tomatoes are keto-friendly, store-bought versions of tomato sauce can be full of hidden sugars, carbs and who knows what else that isn’t good for you.

This is a simple keto tomato sauce recipe that you can use in any way you like. Use this sauce on a cauliflower pizza crust, low-carb eggplant parmesan, or a keto pizza casserole.

The sauce can easily be prepared ahead, saving you time in the kitchen.

How to make keto tomato sauce

Step 1: In a small saucepan over medium-high heat, saute the garlic in the olive oil. Saute for a minute until the garlic is fragrant. Make sure the garlic doesn’t brown and become burnt.

garlic being fried in olive oil

Step 2: Turn the heat down and add the tomatoes, oregano, vinegar, and salt to the saucepan. Bring to a simmer and allow to cook for 30 – 40 minutes, allowing the sauce to reduce and thicken.

sauce being cooked until thick with wooden spoon

Step 3: Use the sauce immediately if desired or store for later use.

Make a batch and store it!

You can use this sugar-free tomato sauce immediately if desired or it can be stored for later use. To store the sauce, allow it to cool to room temperature first. Once cooled, transfer to an airtight container and refrigerate for up to 5 days. 

You can also freeze the sauce after it has cooled to room temperature. Freeze in bags or a container for up to 6 weeks. Defrost before use. 

tomato sauce in pot with spoon

Spicing it up!

Because this keto marinara sauce only uses 5 simple ingredients, it’s a great base that you can add other flavors to.

It tastes fantastic as it is, of course, but you can change the flavor profile by adding additional spices such as basil or parsley. You can also adjust the heat by adding red pepper flakes or even chopped chili peppers.

A sweet sugar-free tomato sauce?

The fact that this sauce is sugar-free doesn’t mean that it can’t be a little sweet! There are many no-carb sweeteners that you can eat on a keto diet.

I have made this sauce with a little bit of Stevia sweetener and it turned out great. Monkfruit sweetener is also a great option. Just be careful and add a little at a time as both sweeteners are quite strong.

Other healthy low-carb recipes to try

If you liked this recipe, here are some other low-carb recipes you might enjoy: 

You can also check out the roundup I created of Healthy Dinner Recipes for Diabetics for even more great recipe ideas.

When you’ve tried this keto tomato sauce recipe, please don’t forget to let me know how you liked it and rate the recipe in the comments below!

Keto Tomato Sauce

4.56 from 52 votes
Leave a review
This is the best recipe for a keto tomato sauce that is full of flavor and can be used in so many recipes. All while only using 5 ingredients!
Prep Time: 5 minutes
Cook Time: 30 minutes
Total Time: 35 minutes
Servings: 10

Ingredients 

  • ¼ cup extra virgin olive oil
  • 3 cloves garlic, finely diced
  • 1 28 ounce can diced tomatoes
  • ½ teaspoon dried oregano
  • 1 teaspoon white vinegar
  • ½ teaspoon salt

Instructions

  • In a small saucepan over medium-high heat, saute the garlic in the olive oil. Saute for a minute until the garlic is fragrant. Make sure the garlic doesn’t brown and become burnt.
  • Turn the heat down and add the tomatoes, oregano, vinegar, and salt to the saucepan. Bring to a simmer and allow to cook for 30 – 40 minutes, allowing the sauce to reduce and thicken.

Notes

You can use this tomato sauce immediately if desired or it can be stored for later use. To store the sauce, allow it to cool to room temperature first. Once cooled, transfer to an airtight container and refrigerate for up to 5 days. 
You can also freeze the sauce after it has cooled to room temperature. Freeze in bags or a container for up to 6 weeks. Defrost before use. 

Nutrition Info Per Serving

Nutrition Facts
Keto Tomato Sauce
Serving Size
 
3 tbsp
Amount per Serving
Calories
58
% Daily Value*
Fat
 
5.8
g
9
%
Saturated Fat
 
0.9
g
5
%
Trans Fat
 
0
g
Polyunsaturated Fat
 
0.6
g
Monounsaturated Fat
 
4
g
Cholesterol
 
0
mg
0
%
Sodium
 
6
mg
0
%
Potassium
 
128.2
mg
4
%
Carbohydrates
 
1.5
g
1
%
Fiber
 
0.5
g
2
%
Sugar
 
1
g
1
%
Protein
 
0.7
g
1
%
Vitamin A
 
0
IU
0
%
Net carbs
 
1
g
* Percent Daily Values are based on a 2000 calorie diet.