I’ve made a few variations of pasta sauce over the years, but this Slow Cooker Spaghetti Sauce is definitely one of my favorites. The long slow simmer caramelizes the sugars in the tomatoes and creates a depth of flavor that can’t be matched. Plus, what more could you ask for than to just throw some ingredients in a pot, forget about it for 8 hours, and then come back to a rich, delicious homemade sauce? Then you can divide the sauce into portions, freeze, and you’ll have delicious homemade pasta sauce on hand for quick busy weeknight dinners.
Why make Homemade Spaghetti Sauce?
Pasta sauce can be bought premade really cheaply, so I think in a lot of cases it does make sense to just buy a jar and go with it. But if you want to have a little more control over the quality and ingredients of your pasta sauce while still keeping costs low, this Slow Cooker Spaghetti Sauce is a great option.
What Size Slow Cooker to Use
This recipe makes about 2 quarts of sauce, so I would suggest using a 3 quart or larger slow cooker. You don’t need anything fancy, just a very basic slow cooker with basic functions like warm, low, and high. I do find that slow cookers made with a thick ceramic insert (or “crock”) cook much more evenly than metal inserts, like you’d have when using the slow cooker function on an Instant Pot.
Why Add Balsamic Vinegar?
The balsamic vinegar in this recipe adds a subtle depth and brightness to the sauce. It can seem strong at first, but it mellows out as the sauce is cooked. If you’re not a fan of balsamic vinegar or just don’t have any on hand, this recipe will still make a really amazing sauce even if you leave it out.
Can I Add Meat?
I’ve tried this sauce before with ground beef and I found the cook time to be far too long for the ground beef, so if you do want to add meat I suggest browning it separately and then just stirring it into the sauce after cooking. You can also check out my quick Weeknight Pasta Sauce for an easy and flavorful meat sauce option.
How to Freeze Pasta Sauce
This recipe makes about 7 cups. I suggest dividing the sauce into two or three cup portions before freezing so you can take out just enough for one recipe at a time to thaw. Let the spaghetti sauce cool completely in the fridge, then transfer to freezer-safe containers to freeze. The sauce will stay good in the freezer for about three months, but this can vary depending on the conditions in your freezer. If you use quart-sized freezer bags and freeze them laying flat they stack nicely in the freezer without taking up much space.
You can thaw the sauce in the refrigerator overnight or just cut the bag away from the frozen sauce, place it in a saucepot, and heat over medium-low until it’s heated through (stir occasionally).
This sauce goes great with Homemade Meatballs (also freezer-friendly)!
Slow Cooker Spaghetti Sauce
Servings 7 cupsIngredients
- 1 yellow onion ($0.32)
- 4 cloves garlic ($0.32)
- 2 28oz. cans crushed tomatoes ($2.00)
- 1 6oz. can tomato paste ($0.69)
- 1 Tbsp dried basil ($0.30)
- 1.5 tsp dried oregano ($0.15)
- 1 Tbsp brown sugar ($0.03)
- 1 Tbsp balsamic vinegar ($0.14)
- 4 Tbsp butter ($0.40)
- 1 tsp salt (or to taste) ($0.05)
Instructions
- Dice the onion and mince the garlic. Place both in a 3 quart or larger slow cooker.
- Add the crushed tomatoes, tomato paste, basil, oregano, brown sugar, balsamic vinegar, and butter to the slow cooker. Stir everything together well.
- Place the lid on the slow cooker and cook on high for four hours or low for eight hours.
- After cooking, give it a good stir, then add salt to taste. Start with just ½ tsp of salt and add more if needed (I added 1 tsp). Use the sauce immediately, refrigerate, or freeze for later.
See how we calculate recipe costs here.
Equipment
Nutrition
Looking for a stove top pasta sauce recipe? Check out our Easy Marinara Sauce.
How to Make Slow Cooker Spaghetti Sauce – Step By Step Photos
Dice one yellow onion and mince four cloves of garlic. Add both to a 3 quart or larger slow cooker.
Add 2 28oz. cans of crushed tomatoes and one 6oz. can of tomato paste to the slow cooker.
Also add 1 Tbsp dried basil, 1.5 tsp dried oregano, 1 Tbsp brown sugar, 1 Tbsp balsamic vinegar, and 4 Tbsp butter to the slow cooker.
Give the ingredients a good stir until they’re evenly incorporated.
Place the lid on the slow cooker and cook on high for four hours or low for eight hours. After cooking, it will look a little like the photo above (the white is just the milk fats from the butter). Give it a good stir.
Add salt to the sauce to taste. Start with ½ teaspoon and add more until the flavors pop. I ended up using one teaspoon total.
Use the slow cooker spaghetti sauce immediately or refrigerate then freeze for long-term storage.
This is my absolute go-to recipe for homemade tomato sauce! I did tweak it a little bit, I sautéed the onion and garlic before adding it to the crockpot, and I also added a 1/2 cup of red wine to it, and it was delicious! My family loves it, and looks forward to pasta nights.
This was fantastic! there’s nothing like coming back from a long day and the house smelling like a delicious, ready spaghetti sauce! I placed some homemade meatballs to finish cooking on low for the last 4 hours of the cooking time. Simply splendid, thank you!
For those wondering about using fresh tomatoes, here’s what I did to make a double batch: I peeled and chopped a dozen medium-ish tomatoes (should have weighed them, thought of that too late) to make about 7-8 cups. I used olive oil instead of butter (thinking the butter’s smoothing qualities are more necessary for canned tomatoes, plus I’m trying to avoid saturated fat) and doubled the rest of the ingredients as listed.
Canned crushed tomatoes are pretty liquid-y, so I wasn’t sure if the chopped tomatoes would release enough liquid. I checked it after an hour on high, and everything was still pretty chunky, so I added about a cup of red wine to loosen things up. After 4 hours, I immersion-blended, added about 3 teaspoons of salt and a bit of extra-virgin olive oil, and all was lovely. I’ll probably skip the sugar next time – like the butter, I think it’s less necessary with fresh tomatoes than canned. I’m very pleased, and I used up a bunch of garden tomatoes!
Can I sub the balsamic vinegar for ACV or rice vin?
Apple cider vinegar would be fine!
Hi,do you think tomato sauce can be used in place of crushed tomato?
Crushed tomatoes are just tomatoes and a little salt, whereas tomato sauce has added ingredients like red pepper, spices, etc. You could try it, but just know that the flavor of the final sauce will be a little different as well as the texture. The crushed tomatoes adds a nice texture and thickness to the sauce, so yours might be a little looser.
Absolutely love this recipe. Delicious and oh so easy! This will be my go to recipe from now on. I double batch to freeze for meals later, besides enjoying a wonderful meal now.
Absolutely love this recipe. Delicious and oh so easy! This will be my go to recipe from now on. I double batch to freeze for meals later, besides enjoying a wonderful meal now.
I made this for my family for Mother’s day and it was a hit! I did swap the butter for olive oil though due to some dietary restrictions. I imagine it would be even better with butter. I also used an immersion blender to get the sauce super smooth because I knew my picky younger sibling wouldn’t eat it if wasn’t smooth throughout. I would definitely make this again, it was easy and delicious!
I know you mentioned that a basic slow cooker is preferred, but I only have an Instant Pot with a metal insert. How would you modify this recipe to use the slow cook function in the Instant Pot?
I think the instant pot slow cooker gets a bit hotter than a regular slow cooker, so I’d probably keep it low if you can, instead of medium or high. Otherwise you should be able to do everything the same. Keep in mind we’ve only used a basic slow cooker though, so it might not turn out exactly the same.