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Crockpot Tomato Sauce Recipe with Roasted Vegetables

Homemade Roasted Tomato Sauce is intensely flavorful. This Crockpot tomato sauce punches up the flavor on homemade tomato sauce.

Roasted Slow Cooker Tomato Sauce
Roasted slow cooker tomato sauce is made with fresh vegetables to your own taste. This sauce is long simmered in a slow cooker for the best flavor!

My daughter, Amanda gave me this healthy pasta sauce recipe. Amanda enjoys recipes that focus on nutrition.

Roasted Slow Cooker Tomato Sauce
Roasted Vegetables are pureed and long simmered to make this tomato sauce

This is a sugar free tomato sauce. Roasting the vegetables concentrates the sugars and flavors in this sauce. This homemade tomato basil sauce recipe is Absolutely EXCELLENT without any extra sweeteners.

The first time I made this sauce I put our greenhouse peppers and Arbason tomatoes in my sauce. You will notice them in the some of the pictures. I also used my homegrown fresh herbs. 

Now I prefer making a San Marzano tomato sauce. Dave started growing San Marzano Roma Tomatoes (pictured below) a few years ago. They make a meatier fresh tomato pasta sauce. Any roma type tomato is preferred for saucing.

Garden Harvested Roma Tomatoes And Peppers
Garden grown San Marzano Tomatoes and fresh peppers used in this recipe.

You can use whatever tomatoes you have. Cook slicing tomatoes or beefsteaks down a bit more to let the extra juices evaporate and make a nice thick sauce.

Homemade recipes like this are unique and easily tailored to your family’s tastes. I’m especially fond of roasting vegetables to enhance their flavors. Try our roasted vegetable recipe for an easy and healthy side dish.

More Fresh Tomato Recipes:

If you’re Looking for more ways to use up fresh tomatoes these recipes are all winners.

Roasted Tomato Sauce Recipe with fresh tomatoes:

There is usually a pretty significant amount of sugar added to pre-made sauces. Ingredients lose a lot of their nutritional benefits and flavor when commercially processed.

Make your own sauce from fresh ingredients for the best flavor and nutrition. Don’t you just love a great tasting healthy tomato sauce?

Freezing Tomato Sauce:

Red sauce is so versatile and can be utilized year round. Freezing tomato sauce is very easy.

  • Complete the roasted tomato sauce recipe as directed.
  • Let the sauce cool to room temperature.
  • Pour the sauce into quart sized Ziplock freezer bags or other freezer containers.
  • Label with the recipe name and date.
  • Freeze up to six months
  • Defrost before using for best results.

Keeps defrosted in the fridge at least a week.

Roasted Slow Cooker Tomato Sauce
If your not a gardener find a local farmers market. Join a CSA or food Co-op. Bring the best organic produce into your family’s diet.

Recipe Notes For Roasted Slow Cooker tomato Sauce:

This sauce is simple and so rich and creamy! All it takes is a little bit of planning and few hours in your crockpot to simmer to perfection. You will roast the fresh tomato-vegetable mixture for about an hour.

Then blend it all up and transfer it to your slow cooker for the rest of the afternoon. Simple! And your house will smell fantastic all day.

First, preheat your oven to 425 degrees F.

Preparing the Vegetables:

  • Next, chop your Tomatoes. Roma type preferred. However,They can be any kind just make sure they are a deep red color to ensure lots of flavor.
  • Quarter them and lay them down in the pan.
  • Rough chop your onion, dropping the pieces over top of the tomatoes.
  • Chop peppers and arrange them in your baking dish with the onion and tomato chunks.
  • Add your whole cloves of garlic. Place them among the onions, peppers and tomatoes.
  • Tear a few fresh basil leaves and sprinkle them around.
  • Drizzle the mixture with some Olive oil, Sea Salt and fresh ground Pepper.
  • Using your hands, mix it all around to coat everything 

The Roasting Process:

Place the prepared vegetables in your preheated oven for 45 minutes to an hour.

Here is a visual Guide to the process. Chop, roast and puree.

Revel in how amazing it all smells.

Roasted Slow Cooker Tomato Sauce
After roasting the veggies, they will be carmelized and the flavors and natural sugars will concentrate into the veggies. Giving a huge flavor boost to your sauce!

Puree the Vegetables:

  • Once all are soft and slightly caramelized cool them and blend into a puree.
  • Spoon the roasted vegetables into your food processor or blender. (do this in small batches if necessary)
  • Add the can of Tomato paste and 1 Tablespoon of Balsamic Vinegar.
  • Pulse or blend to a smooth, creamy consistency. You can add some of the juices from the baking dish if you would like to thin it out.
Roasted Slow Cooker Tomato Sauce

Slow Cook:

Any slow cooker will work. Today there are so many different multi cookers in our kitchens. If they slow cook you can make this recipe in them.

Instant Pot Tomato Sauce:

To make this pasta sauce recipe in your instant pot. Use the slow cook function and follow the instructions in this recipe exactly.

I use my instant pot for slow cooking. It is a bit slow compared to other slow cookers. Therefore I recommend….

Bump up the heat one level to medium rather than low for the instant pot. They tend to cook slower than a crock pot.

Finishing:

Transfer the sauce to your crockpot or Instant Pot and cook on low for 4-6 hours. The longer you let it simmer the sweeter the Roasted slow cooker tomato sauce will become.

At this point add any extra spices you prefer. For example extra oregano or a bit of dried Rosemary. 

Turn this red sauce into a pasta topping. Use this recipe as a base for soups or make it into a spaghetti sauce from fresh tomatoes.

The basil and garlic are SO helpful in bringing that Italian flavor to the table.

Tips and Ideas for this Recipe:

  • Add browned meat to your slow cooker when you pour in the roasted puree.
  • Add 1 pound of browned Italian sausage to the cooker. My mom uses sausage in her 5 Cheese Homemade Lasagna sauce.
  • Ground beef or ground turkey also make nice additions to this slow cooker tomato sauce. 
  • Add chopped mushrooms or spinach in the last hour of simmering to bump up the texture and nutritional benefits.
  • Refresh any dried spices in the last 30 minutes of simmering to keep the flavors powerful.
  • Red pepper flakes, fresh rosemary leaves and fresh oregano all make great enhancements to this recipe. Use what you like.
Roasted Slow Cooker Tomato Sauce

Our family enjoyed this over whole grain pasta for a simple, filling dinner.

Your Printable Recipe Card:

Roasted Slow Cooker Tomato Sauce
Yield: 10 servings

Roasted Tomato Sauce-Slow Cooker Method

Prep Time: 15 minutes
Cook Time: 7 hours
Total Time: 7 hours 15 minutes

Roasted Slow Cooker Tomato Sauce method punches up the flavor on homemade tomato sauce. Roasting veggies concentrates their flavor. Long simmering the sauce keeps it simple and really blends the flavor together.

Ingredients

  • 12 Ripe Tomatoes (Roma type preferred but any variety will work)
  • 2 ripe peppers (any type or heat you prefer)
  • 1 Onion
  • 10 cloves of Garlic
  • 1/4 cup chopped Fresh Basil (several fresh leaves)
  • 1 tsp. Sea Salt and fresh ground Pepper
  • 1 Tablespoon Olive oil (as needed)
  • 1 can of Tomato paste
  • 1 Tablespoon Balsamic Vinegar

Instructions

  1. Preheat your oven to 425 degrees F

CHOP:

  1. Chop the Tomatoes. They can be any kind but ripe Roma tomatoes have the best texture for sauce.
  2. Deseed and Chop your peppers into one inch chunks
  3. Quarter the tomatoes and peppers and lay them down in a shallow oiled 9 x 13 baking dish pan.
  4. Rough chop the onion. Drop the onion pieces over top of the tomatoes and peppers.
  5. Add the whole cloves of garlic. Sprinkle them among the onions, peppers and tomatoes.
  6. Tear a few fresh basil leaves and sprinkle them around.
  7. Drizzle the mixture with some Olive oil, Sea Salt and fresh ground Pepper.
  8. Using your hands, mix it all around to coat everything.

ROAST:

  1. Place the pan of vegetables in your preheated oven for 45 minutes to an hour.
  2. Revel in how amazing it all smells.
  3. Once the vegetables are soft and slightly caramelized remove from oven.
  4. Cool until you can handle the vegetables to transfer them to blender.

BLEND:

  1. Place the roasted vegetables into your food processor or blender. Add the can of Tomato paste and the 1 Tablespoon of Balsamic Vinegar.
  2. Pulse or blend to a smooth, creamy consistency. You can add some of the juices from the baking dish if you would like to thin it out.

SLOW COOK:

  1. Transfer the sauce to your crockpot and cook on low for 4-6 hours.
  2. At this point add any extra spices you would like. I added some Oregano a bit of dried Rosemary and some more Pepper.
  3. You could also cook up and add your meat to your crock pot if you are wanting to make it a meat sauce.

Nutrition Information

Yield

10

Serving Size

1

Amount Per Serving Calories 71Total Fat 2gSaturated Fat 0gTrans Fat 0gUnsaturated Fat 1gCholesterol 0mgSodium 257mgCarbohydrates 13gFiber 4gSugar 7gProtein 3g

Did you make this recipe?

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The Best Tomato Veggie Pasta Sauce-Pin Image
Homemade Roasted Tomato Sauce is intensely flavorful. This Crockpot tomato sauce punches up the flavor on homemade tomato sauce.

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Linda

Wednesday 11th of August 2021

How do you store the finished Roasted tomato sauce? Frozen? Canned?

Diane

Wednesday 11th of August 2021

Hi Linda,

This sauce will hold in the fridge in an airtight container a week or more in good conditions. You can freeze this sauce in air tight freezer bags or containers for up to 6 months.

If you need canning instructions and a canning tested recipe for roasted tomato sauce Here's one that comes from a food blogger I trust..

Hope this helps! Have a wonderful day.

Leann

Wednesday 28th of April 2021

Can you use frozen tomatoes for this recipe?

Diane

Wednesday 28th of April 2021

Hi leann, I believe frozen tomatoes would work fine in this recipe. Just peel them before you use them. Please let us know how it goes for you!

Lori

Friday 27th of December 2019

The recipe does not indicate when to add the peppers

Diane

Saturday 28th of December 2019

Hi Lori, Thank you so much for pointing this out. I have updated the recipe for you. Have a great weekend!

Teri Leger

Monday 7th of October 2019

Can this recipe be made ahead of time and put in the fridge for a few days..

Kayti Lavergne

Monday 7th of October 2019

Hi Teri! yes you can keep it up to a week in the fridge in an airtight container :)

Hearth and Soul Blog Hop: November 3rd week - Zesty South Indian Kitchen

Wednesday 30th of November 2016

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