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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

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.

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 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?

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

Sugar-Free Crockpot Spaghetti Sauce WEIGHT WATCHERS POINTS

One serving of Garden Fresh Crockpot Spaghetti Sauce has 0 WW Freestyle SmartPoints.

Making this recipe or others?

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a bowl of crockpot spaghetti sauce with tomatoes and herbs
Print
4.67 from 3 votes
Crockpot Spaghetti Sauce {Sugar-Free Spaghetti Sauce}
Prep Time
35 mins
Cook Time
7 hrs
Total Time
7 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.

Course: Main Course
Cuisine: Italian
Keyword: crockpot spaghetti sauce, slow cooker spaghetti sauce, whole30 spaghetti sauce
Servings: 20
Calories: 25 kcal
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
  1. Rinse your tomatoes and core them. Drop them in a pot of boiling water for one minute.

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

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

  4. 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.

  5. 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.

  6. Add the baking soda (it will foam a bit), salt and pepper, and additional herbs to taste. 

Recipe 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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16 comments on “Crockpot Spaghetti Sauce {Sugar-Free Spaghetti Sauce}”

  1. I have a bunch of rando tomatoes from our CSA share this week. Just under 5lbs of heirlooms, cherry tomatoes and a few romas. I have no clue how many cups that would be. Any idea if I need more/less? I am currently pregnant and just thinking about tomatoes gives me horrendous heartburn and acid reflux, so I would to make sauce and stick it in the freezer! 

    • It kind of depends on the size of the tomatoes as to how many cups it turns out to be. I would say just go for it and adjust the seasonings as needed. It’s not a hard and fast kind of recipe. 🙂

      Congrats on the pregnancy!

  2. Can you freeze this sauce in freezer bags?

  3. This recipe was okay, I will adjust a few things when I make this again and I will make it again. Add a little bit more fresh basil and I added some red wine, I add some more water as it was cooking down. I did like adding the baking soda and how it works the same way as sugar, it did change the color a bit. Hubby did enjoy this. 😊

    • Glad to hear you enjoyed it Cynthia and that you were able to adapt it to your preferences!

      I’m shocked you hadd to add water to the sauce during the cooking process. You must have had some amazingly “meaty” tomatoes.

  4. Love homemade tomato sauce!! This looks so good.

  5. Having a garden full of rando tomatoes might be my new top goal in life. This looks crazy good! 

  6. Okay, 1) Buffalo Bill said that?, 2) I *personally* like mushrooms but alas my son’s on your side, and 3) I haven’t seen / heard the baking soda before — what’s up with that?

    • Buffalo Bill from Silence of the Lambs. Ha!!!

      Baking soda neutralizes the acidity of the tomatoes and allows you to enjoy a balanced product without sugar. I use it in pizza sauce, tomato soup, and iced tea. I’m Team Baking Soda all the way!

  7. Why baking soda?

    • Giiiiiirl, baking soda is my favorite kitchen hack!

      It neutralizes the acidity of the tomatoes without using sugar. I also use in it batches of iced tea, pizza sauce, and tomato soup for the same reason.

      • I keep a small container of baking soda in the car for bee and wasp stings and if I get an ice tea at the coffee shop it’s always to bitter.

      • We always used powdered meat tenderizer growing up for bee stings, but I suppose there is a lot of baking soda in there! How many times do you get stung that you have to carry around baking soda?