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Roasted Tomato Blender Marinara (Low Carb)

Roasted Tomato Blender Marinara (Low Carb)

Pasta sauce isn’t just for pasta, but it can be full of added sugar. If you are going into the new year wanting to cut sugar, this low carb roasted tomato blender marinara will make quick work of this versatile pantry staple.  Fresh tomato sauce is best in summer, so make sure you store this one away!

Throw it on a chicken breast or zucchini noodles-this low carb marinara sauce will serve all your keto recipe needs as well. Call it low carb pasta sauce or keto pasta sauce, either way, the carbs and sugars are only from the actual tomatoes.

Roasted Tomato Blender Marinara


Roasted Tomato Blender Marinara- Tips

My first tip is to use fresh tomatoes. Tomato season is the perfect time for this recipe! Specifically Roma tomatoes or Plum tomatoes. They have a nice flesh to juice ratio and they will actually roast. If you have some cherry tomatoes, throw those in too. The roasting brings out the natural sugar in the tomatoes and negates the need to add sugar.

Roasted Tomato Blender Marinara

Fresh Tomato Goodness.


Roasted Tomato Blender Marinara

See that sticky goodness? This is where parchment is key.

Good olive oil is a must here because it adds to the very few ingredients in this pasta sauce. You want a good robust olive olive oil for this recipe. I always use extra-virgin olive oil. A pinch of red pepper flakes are something I love in my pasta sauce. The amount called for here is equal to a medium heat. If you really don’t like heat, you can leave those out.

Probably the best part about this recipe is that it’s full of simple ingredients and as they should be, tomatoes are the main ingredient. You don’t need tomato paste and all these different products. It’s a great recipe for simple cooking.

Roasted Tomato Blender Marinara

The recipe calls for dried oregano and dried basil These can be replaced with Italian seasoning to taste, fresh basil, or any fresh herbs you like.  This homemade sauce is the perfect place for those summer herbs.

If you like parmesan in your pasta sauce, feel free to add some parmesan cheese when you heat it up. I just wouldn’t add it if you plan on prepping and storing it.

You can use a regular blender or an immersion blender.  A food mill will give you a chunkier texture if that’s what you like.  If you like a smoother sauce, use a blender.

Substitutions in Blender Marinara

There really aren’t any subs I can recommend here. This pasta sauce is gluten free, dairy free, low carb and keto friendly. I just can’t imagine what you’d need to take out.

If you don’t want to use it or don’t have fresh garlic, feel free to sub in garlic powder. I personally prefer fresh garlic cloves because when you are using so few ingredients , each one needs to pack a punch.

You may like you tomato sauce more acidic.  If so,  I recommend adding lemon juice or splash of balsamic vinegar.

f you like a more chunky sauce, don’t blend it as much, but honestly I think this is best smooth. 

This homemade marinara sauce recipe is very straight forward. It’s truly classic marinara sauce.

Ways to serve this Low Carb Pasta Sauce Recipe

While I don’t subscribe to any one diet plan, I know others do and if you are on a keto diet, low-carb diet, vegan diet, or Whole30 this January, this is going to be a great way to top your favorite proteins, veggies and low-carb pasta.

This is the best sauce I’ve ever made from scratch and here are some ideas to use it!

  • Serve with pepper and Italian Sausage
  • Use it as a dipping sauce for my Almond Flour Air Fried Chicken
  • Add ground beef and make a meat sauce
  • Use it for pizza sauce
  • Serve over shirataki noodles (for low carb or keto)- Your favorite Pasta if not
  • Use it for low carb lasagna with zucchini noodles

Hopefully these ideas are helpful and inspire your recipes!

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Baking Sheet

Food Processor by Ninja-my favorite

Storing Leftover Marinara

Store your sauce in an airtight container for 3-4 days.  After that, I like to freeze it in plastic zip bags.  It’s so nice to be able to enjoy this beautiful tomato sauce during those colder months!  Fresh Garden tomatoes in December?  Yes Please!  This is the beauty of making your own marinara sauce.  You get to enjoy good quality marinara all year long. 


Leave a Comment and Star Rating

I hope this super easy low-carb spaghetti sauce gives you the confidence you need to make your own sauce. It’s one of my favorite ways to make it and it really simplifies the process. If you make it, please leave a rating below and let us know how it went for you. I hope this easy recipe is one you reach for again and again. It’s my go-to recipe for ripe tomatoes. Thanks for stopping by!




Pin for Later!  Make sure you tag me @freshfitkitchen on Instagram if you make it!

Roasted Tomato Blender Marinara


Last updated 4/23/24.

Roasted Tomato Blender Marinara

Roasted Tomato Blender Marinara

Roasted Tomato Blender Marinara takes fresh garden plum tomatoes and turns them into a thick and sweet marinara you can put on pizza, pasta and more. This recipe freezes beautifully.
Prep Time 15 minutes
Cook Time 40 minutes
Total Time 55 minutes
Servings 6 People


  • 24 Plum Tomatoes quartered
  • 2 tbsp. garlic minced
  • 4 tbsp. olive oil
  • 1/2 tsp. Dried Oregano
  • 1 tsp. Dried Basil
  • 1/2 tsp. Crushed Red Pepper optional
  • salt to taste
  • Black Pepper to taste
  • water for thinning sauce to your preference


  • Preheat oven to 350 Degrees. Cut tomatoes and garlic then toss with olive oil onto a parchment lined sheet pan. Make sure tomatoes are in a single layer. If not, use 2 pans. Do not salt the tomatoes at this stage.
  • Roast the tomatoes for 20 minutes , toss and roast 20 more. Remove from oven and allow to cool for 5 minutes.
  • Add the mixture to a blender with the oregano, basil, and crushed red pepper if using. Blend it all up and add some salt. You'll want to add salt and pepper to your personal tastes. Keep some water nearby to thin the sauce to your desired consistency.


I find the tomatoes to sweeten so much from roasting that I don't need any sugar or honey to cut the acidity.  If you do, add a little in the blending stage. This recipe is easily doubled or tripled depending on your tomato count.
Tried this recipe?Let us know how it was!

This recipe was last update 1/2/2023.

Recipe Rating

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Friday 26th of January 2018

YUM! I added some garlic and a drizzle of balsamic vinegar, it was so good :-)


Sunday 28th of January 2018

Hi Gayle! I am so glad you enjoyed it! The addition of garlic and balsamic sounds amazing!

Walsh Eleanor

Sunday 1st of October 2017

Made this today its easy and good. No added sugar was necessary. Highly recommend !!??


Monday 2nd of October 2017

That's awesome ! I am so happy to hear this worked out so well for you. :)


Wednesday 20th of September 2017

Awesome! First batch complete. Added some sweet onions to the roasting pan too. Batches two and three are in the oven. What a simple, wholesome recipe!


Wednesday 20th of September 2017

Aerie! I am so happy you enjoyed it. The onions are a great addition. It's a super versatile recipe. I am so glad it worked out for you!

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