Keto Spaghetti Sauce

Make my keto spaghetti sauce recipe whenever you need a rich, deeply flavorful red sauce. It’s easy to make, completely sugar-free, and perfect over low-carb pasta! 3 grams of net carbs. 

Need more keto sauce recipes? Try my keto teriyaki sauce, keto cheese sauce, or keto stir fry sauce next.

I’ve been making spaghetti sauce from scratch for years, ever since my mom shared her recipe with me. Since going keto, I’ve had to give my favorite recipes a low-carb makeover. 

Que, my keto pasta sauce. Made with a shortlist of wholesome ingredients, it doesn’t taste keto—it just tastes homemade. 

Table of Contents

1. Why I love this recipe
2. Ingredients needed
3. How to make keto spaghetti sauce
4. Arman’s recipe tips
5. Storage instructions
6. More keto Italian dishes
7. Keto Spaghetti Sauce (Recipe Card)

Why I love this recipe

• Better than store-bought. There’s something about homemade sauces that just tastes better, and my spaghetti sauce is no exception. Use it with my keto spaghetti, and you’ll think you’re in Italy!
• Naturally sugar-free. Since when did tomato sauce start needing sugar? So long as your tomatoes are ripe, they should be sweet enough. 
• Versatile. It’s perfect over pasta, as pizza sauce, or atop vegetables. There are no wrong options.
• Freezer-friendly. If I’m making spaghetti sauce, you better believe I’m making extra to freeze for later.

Ingredients needed

• Onion. Adds a lovely flavor to the sauce, especially when paired with garlic. 
• Celery. Thickens the sauce. 
• Garlic. A must for any good tomato sauce. 
• Extra virgin olive oil. To sauté the veggies. 
• Crushed tomatoes. Most grocery stores stock Italian-style crushed tomatoes, which are ideal, but plain tomatoes will also work. Just make sure there is no added sugar. 
• Allulose (or keto sweetener of choice). You may or may not need this, depending on how sweet the tomatoes are. I find just a pinch brings out their natural sweetness. 
• Basil. Fresh basil is preferred, but dried can also work. 
• Salt and black pepper. To taste. 

How to make keto spaghetti sauce

I’ve included step-by-step photos below to make this recipe easy to follow at home. For the full printable recipe instructions and ingredient quantities, scroll to the recipe card at the bottom of this post.

Step 1- Combine ingredients. Add olive oil to a large pot over medium heat. Once hot, add the veggies and cook until tender. Add the remaining ingredients and bring to a boil. 

Step 2- Simmer. Once boiling, reduce the heat to low, cover, and simmer for 40 minutes.

Step 3- Serve. Remove the sauce from the heat and serve.

Arman’s recipe tips

• Make a smooth sauce. Once it’s done simmering, add everything to a blender (or use an immersion blender) and blend until smooth. 
• Make a meat sauce. Add one pound of ground beef, chicken, or your preferred protein and cook fully before adding the tomatoes. 
• Or make a pink sauce! Right before serving, stir in heavy cream and parmesan cheese. 
• Prefer a thicker sauce? Simmer it for up to an hour. 
• Add spices. Like Italian seasoning, dried oregano, garlic powder, onion powder, or red pepper flakes for a little heat. 

Storage instructions

To store: Pasta sauce should be stored in an airtight jar in the refrigerator for up to two weeks. 

To freeze: Place leftover sauce in a shallow container and freeze it for up to 6 months. 

Reheating: Simmer in a pan over medium heat or microwave until warm.

More keto Italian dishes

• Keto eggplant parmesan
• Keto chicken parmesan
• Keto meatballs
• Chicken crust pizza