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Crockpot Spaghetti Sauce {Sugar-Free Spaghetti Sauce}

This fresh, homemade Crockpot Spaghetti Sauce is a delicious meatless sauce made from scratch. This paleo/Whole30 spaghetti sauce creates magic from fresh tomatoes and herbs. Make a huge batch of fresh tomato sauce and learn how to freeze it to enjoy your garden bounty all year long.

a bowl of crockpot spaghetti sauce with tomatoes and herbs

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Have you ever thought “can I make spaghetti sauce in a crockpot” to yourself? These are the things that keep me up at night.

And the answer is heeeeeeck yes you can! And you should because then you don’t have to stir a pot all day long for hours and hours. Snoooooore.

The slow cooker heats evenly and gently and does its thing without burning the sauce. Pure magic my friends. Pure magic.

What Kind of Tomatoes Work Best in Crockpot Spaghetti Sauce?

Heartier paste style tomatoes are the easiest to work with for homemade sauce. They are easy to peel and have fewer seeds. They also have a lower moisture content which means they take less time to cook down.

But sometimes you (ok, it’s me) have 18 different tomato plants that are all ripening at the same time and you need to do something with them. This crockpot spaghetti sauce is the perfect home for those rand-o tomatoes.

If you are using tomatoes that are more suitable to sandwiches (“slicers”), you’ll want to mix them with some paste-style tomatoes for it to reduce/thicken.

How Do You Take Sweetness Out of Spaghetti Sauce?

tomatoes, garlic, and herbs on a wooden board

The secret ingredient for removing sweetness and acidity from tomato sauce is…baking soda! I know, right? 

I use baking soda to marinate the chicken in Instant Pot Orange Chicken, to cut the acidity in Sugar-Free Pizza Sauce, Whole30 Tomato Soup, and remove the bitterness from Healthy Sweet Tea. Baking soda ROCKS.

Urrr, This Crockpot Spaghetti Sauce Seems Like It Has A Lot of Steps

Yeah, it looks pretty time intensive but it is all related to removing the skins and seeds from your fresh garden tomatoes. Removing the tomato skin and seeds keeps the sauce from becoming bitter which means you don’t need to add sugar to your sauce to balance it all out.

Do I Have to Peel Tomatoes To Make Sauce?

You don’t have to, but it will impact the overall texture of your finished sauce if you don’t.

Don’t want to take that extra step? I got you covered. Cut the tomatoes in half, push the seeds out with your thumb and then grate the tomato using a box grater, discarding the skins.

It’s not foolproof as some skin will still get mixed in, but that’s ok.

“Life’s short – eat some skin. And put the lotion in the basket” – Buffalo Bill, Silence of the Lambs, and foodie

If you’re a canner, check out these posts on Canning Tomatoes {Whole tomatoes} and Canning Stewed Tomatoes because both can help you make amazing homemade spaghetti sauce on the fly.

Here’s How to Make Crockpot Spaghetti Sauce

*A detailed and printable recipe card is available at the bottom of this post.

Rinse your tomatoes and core them. (gently) Drop them in a pot of boiling water for one minute.

Scoop them out with a slotted spoon and put them in a bowl of ice water. Now the skins will slip off easily. Yay!

boiling and icing tomatoes for crockpot spaghetti sauce

Cut in half (quarters for larger tomatoes) and push out the seeds out with your thumb.

peeling and deseeding a tomato for crockpot spaghetti sauce

Add the tomatoes and all the ingredients (except baking soda) to your slow cooker. Cook on low for 10 hours or high for 7 hours. Stir occasionally.

crockpot spaghetti sauce in 3 steps

If you want a less chunky sauce, pulse it a few times with an immersion blender or mash it a bit with a potato masher or large spoon. Add the baking soda, salt and pepper, and additional herbs to taste.

Pro Tips/Recipe Notes

  • I used my Instant Pot on the slow cooker function with the slow cooker lid for this recipe.
  • Making this all day and then refrigerating it overnight gives it an extra kick of awesome in the flavor department. Kick in the flavor pants?
  • Try it for a dipping sauce for Air Fryer Ravioli. I also use 2 tbsp of it as the secret ingredient in my Whole30 Pot Roast. Yep, marinara in pot roast!
  • Want to up the veggie factor? Sneak in some frozen pumpkin. No one will know!

How to Freeze Spaghetti Sauce

You can freeze this sauce in a wide mouth canning jar. Make sure to leave 1 inch of space between the top of the sauce and the top of the jar to allow for expansion during freezing.

Check out this post on Canning Supplies for my favorite sources for cheap or free canning jars.

a jar of crockpot spaghetti sauce with herbs and fresh tomatoes

Variations

  • Feel free to add meat if you’d like. Just make sure you fully cook it before incorporating it into the sauce.
  • If you hate yourself and love green peppers and fungus, add some mushrooms or peppers. Barf.

Need help getting started off with your Whole30 round on the right foot? Download my totally free Trader Joe’s Whole30 Shopping List and Whole30 Costco Shopping List. I have done all the work for you with checking ingredients and figuring out safe foods. 

More Recipes Like This

WEIGHT WATCHERS POINTS

One serving has 0 WW Freestyle SmartPoints.

a bowl of crockpot spaghetti sauce with tomatoes and herbs
Print Recipe
4.75 from 4 votes

Crockpot Spaghetti Sauce {Sugar-Free Spaghetti Sauce}

Prep Time35 mins
Cook Time7 hrs
Total Time7 hrs 35 mins
This fresh, homemade Crockpot Spaghetti Sauce is a delicious meatless sauce made from scratch. This paleo/Whole30 spaghetti sauce creates magic from fresh tomatoes and herbs.

Ingredients

  • 10 cups tomatoes roughly chopped
  • 2 tbsp basil, fresh (or 2 tsp dried)
  • 1 tbsp oregano, fresh (or 1 tsp dried)
  • 1 tbsp parsley, fresh (or1 tsp dried)
  • 6 cloves garlic roughly chopped
  • 1 cup onion chopped
  • 6 oz canned tomato paste (optional)
  • 1/8 tsp baking soda
  • salt and pepper to taste

Instructions

  • Rinse your tomatoes and core them. Drop them in a pot of boiling water for one minute.
  • Scoop them out with a slotted spoon and put them in a bowl of ice water. Now the skins will slip off easily. 
  • Cut in half (quarters for larger tomatoes) and push out the seeds out with your thumb.
  • Add the tomatoes and all the ingredients (except baking soda) to your slow cooker. Cook on low for 10 hours or high for 7 hours. Stir occasionally if possible. The sauce should be reduced by about half.
  • If you want a less chunky sauce, pulse it a few times with an immersion blender or mash it a bit with a potato masher or large spoon. Add the canned tomato paste at this point if you'd like a thicker sauce.
  • Add the baking soda (it will foam a bit), salt and pepper, and additional herbs to taste. 

Notes

Making this all day and then refrigerating it overnight gives it an extra kick of awesome in the flavor department.
 
You can freeze this sauce in a wide mouth canning jar. Make sure to leave 1 inch of space between the top of the sauce and the top of the jar to allow for expansion during freezing.
Nutrition Facts
Crockpot Spaghetti Sauce {Sugar-Free Spaghetti Sauce}
Amount Per Serving (0.25 cup)
Calories 25
% Daily Value*
Fat 0g0%
Saturated Fat 0g0%
Cholesterol 0mg0%
Sodium 79mg3%
Potassium 281mg8%
Carbohydrates 5g2%
Fiber 1g4%
Sugar 3g3%
Protein 1g2%
Vitamin A 785IU16%
Vitamin C 13.3mg16%
Calcium 18mg2%
Iron 0.6mg3%
* Percent Daily Values are based on a 2000 calorie diet.

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31 comments on “Crockpot Spaghetti Sauce {Sugar-Free Spaghetti Sauce}”

  1. Do I leave the top on my crockpot while cooking?

  2. The spices are added in during the 7-10 hour cooking time and not just stirred in at the end, correct?

  3. Why the baking soda?

    • There is a note about it in the post: “The secret ingredient for removing sweetness and acidity from tomato sauce is…baking soda! I know, right?”.

      I use it for tomato soup, pizza sauce, and spaghetti sauce. It’s a fun secret trick!

  4. I’ve cooked this for 6 hours on high with lid on. It hasn’t reduced hardly at all. 

  5. can you can this sauce?