Marinara Sauce

Marinara Sauce

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Make my keto marinara sauce for easy dinner recipes. Simply, slow cook tomatos with butter and onion in a pot. You can use this sauce with veggies, zoodles and Thin Crust Pizzas. It's a great recipe to make and store in the refrigerator for weekday meals. If you like this recipe, share it with friends and family on social media!

Keto Marinara Sauce

Make my keto marinara recipe with lots of butter. The final ratio of macronutrients is keto friendly. Add it to Thin Crust Pizzas.

Keto marinara sauce for family dinners. Keto tomato sauce recipe for pasta recipes and the ketogenic diet.


  • 2 large cans* Tomatoes (28 oz. each)
  • 1 cup Butter
  • 1 large Yellow Onion
  • 1 tsp. Mineral Salt
  • Black Pepper to taste
  • Optional: Heavy Cream, Fresh Herbs, Garlic

View my Full Shopping List for more keto approved ingredients.

Best keto marinara recipe to make pasta sauces and spaghetti. Make my keto marinara sauce recipe.


Pour the tomato cans, butter, and salt into a pot. Peel and cut the onion in half and place both halves into the sauce. Simmer on medium heat for 45-60 minutes with the lid uncovered. Occasionally stir.

At the end of cooking, remove the onion halves and blend with an immersion blender. You can also use a blender. Make sure to cool the marinara sauce before using a blender.

For a quick meal, you can sauté a few handfuls of spinach with butter. Pour the tomato sauce on top of the sautéed spinach, then garnish with parmesan, fresh herbs, sausage, and Toasted Seeds

Cooking Tips

  • Cooking and removing the onion is called "sweating" the onion. The released juices will flavor the sauce with few added carbs.
  • Resist the urge to add more ingredients. Any alterations will take away from the integrity of this marinara sauce. 
  • *Use fresh tomatoes for a tasty variation. Chop and simmer the tomatoes for a couple hours in a large pot. Add the butter and onion after the tomatoes have reduced. 


Makes about 6 servings
Serving size 1 cup

  • Fat 30g
  • Net Carbs 8g
  • Protein 2g
  • Calories 308

Learn more about weight loss on the keto diet.

Tasteful Keto

Explore all my Keto Recipes by Tasteful Keto. This marinara sauce is great to eat with Thin Crust Pizzas.

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