Keto Ketchup | Sugar Free Tomato Sauce

An absolutely delicious and EASY Keto Ketchup recipe that even the kids will love. A sugar free tomato sauce that is <1g net carbs per serve. Make it today!
Before jumping to the recipe please note that the below information contains HOT TIPS for this recipe. We try and answer all your questions to guarantee a perfect keto recipe every time.

A great keto ketchup recipe is one to have. This is such an easy sauce to make at home.

Growing up I have to say ketchup or tomato sauce, as we call it here in Australia, may have been poured over most foods I ate. I distinctly remember both me and my brother refusing to eat scrambled eggs because there was no ketchup in the house. Even today I am a bit partial to a little “now” sugar free tomato sauce on my eggs or a burger.

Keto Ketchup Ingredients

The ingredients for this keto ketchup recipe can all be found at the local supermarket. In fact, most will probably be in your keto pantry right now.

Here are all the ingredients you need to make homemade sugar free ketchup.

HOT TIP – If you like it spicy add some chilli flakes, cayenne, or fresh chillies to the mix, you could even add some hidden vegetables like zucchini, carrot or mushrooms.

Keto Ketchup ingredients on a white marble background

How To Make Keto Ketchup

This recipe is so EASY! Honestly, you can make it harder by roasting or grilling the tomatoes, but I just want quick and easy.

I have given you methods to make a Thermomix keto ketchup, and Instant Pot ketchup recipe and method, and good old stove top method.

It is very simply cooking until thick. Pureeing to the desired consistency you want. (I like mine still a little chunky). And then pouring into to some sterilised jars and sealing.

Keto Ketchup in a white bowl with tomatoes around it

FAQs and More Hot Tips

Okay so what questions do you have about this keto tomato sauce?

Can I use canned tomatoes?

Yes, you most certainly can! I prefer the Rich and Thick Ardmona tomatoes in any sauces I use.

Is ketchup keto-friendly?

Well not the one’s from the supermarket, lol. There are some lower in sugar, but it is so easy to make your own homemade keto ketchup without any additives, sugar, or preservatives. So, give it a try.

I don’t have a blender?

You can still make this sauce without a blender. Simply use a masher or your hands to squish the tomatoes.

Keto Ketchup in a white bowl with tomatoes and parsley scattered to the side

Tools I use

Instant Pot – This is easily one of my Top 3 kitchen appliances, You can sauté, ferment, slow cook and pressure cook. It takes up very little room in the kitchen and is a MASSIVE time saver.

Thermomix – Another appliance in my Top 3 for all the reasons above and more.

Canning Jars – I am obsessed with Kilner Glass Jars! While they are super functional in my test kitchen they are of superior quality and look gorgeous with any homemade sauces, jams, chutneys etc. These would also be beautiful to make homemade treats and gift at Christmas time.

ketchup pinterest banner

For more great keto sauce recipes

  1. Keto Big Mac Sauce
  2. Best Ever Enchilada Sauce
  3. Keto Cranberry Sauce
  4. Best Keto Cheese Sauce
  5. Keto Sweet and Sour Sauce
  6. Keto Marinara Sauce
  7. Hot Chocolate Fudge Sauce


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Mad Creations Keto Ketchup

Keto Ketchup Sugar Free Tomato Sauce

An absolutely delicious and EASY Keto Ketchup recipe that even the kids will love. A sugar free tomato sauce that is <1g net carbs per serve. Make it today!
5 from 3 votes!
Prep Time: 10 mins
Cook Time: 50 mins
Total Time: 1 hr
Course: Condiment, Sauce
Cuisine: American, Australian Keto
Recipe Category: Low Carb
Calories: 17kcal
Author: Megan Ellam
Servings: 50 serves (makes 5 cups)
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  • 1 1/2 kg tomatoes See Note 1
  • 1/4 cup olive oil extra virgin
  • 1 tbsp salt flakes if using iodised salt reduce to 1 tsp, salt flakes are not as strong
  • 1/2 fire roasted red capsicum See Note 2
  • 70 g tomato paste
  • 80 g apple cider vinegar
  • 1 tsp paprika
  • 1/4 tsp cinnamon ground
  • 1/4 tsp nutmeg ground
  • 1/4 tsp onion powder
  • 1/2 tsp celery salt
  • 50 g sweetener of choice, I use Sukrin Gold, See Note 3



  • Place all the ingredients into a large pot. Cook stirring occassionally until sauce is thick and reduced by one quarter (about 30 minutes).
  • Ladle sauce into a blender in batches and puree until smooth (or use a stick blender). Pour into clean santised jars and store in the refrigerator.


  • Place all the ingredients into the mixer bowl. Chop 4 sec/speed 4. Cook 50 min/100°C/speed 2.
  • When sauce has finished cooking mix 1 min/gradual speed up to speed 9
  • Check consistency, if needed cook a little longer until a ketchup consistency is achieved.


  • Place all the ingredients into the pot. Lock the lid in place and set to Pressure Cook/8 minutes/ natural release for 15 minutes.
  • Ladle sauce into a blender in batches and puree until smooth (or use a stick blender). Pour into clean santised jars and store in the refrigerator.


  1. Fresh and canned tomatoes can be used.
  2. I have a lot of friends who cannot eat capsicum so YES this can be left out.
  3. I use Sukrin Gold granular sweetener but any sweetener can be used. I do recommend sweetener to be included in the sauce as it does de-bitter the tomatoes.
  4. The sauce can be stored in the refrigerator at length if properly “canned”. Please use Google search for tips if you need them.
  5. Keto Ketchup can also be frozen. I recommend pouring into ice cube trays then freezing. Remove from the tray and transfer to a ziplock bag. This way you can thaw smaller serves or pop a cube or two in your cooking straight from the freezer.


Serving: 1serve (25g) | Calories: 17kcal | Carbohydrates: 1g | Protein: 1g | Fat: 1g | Saturated Fat: 1g | Sodium: 175mg | Potassium: 87mg | Fiber: 1g | Sugar: 1g | Vitamin A: 291IU | Vitamin C: 4mg | Calcium: 4mg | Iron: 1mg | Magnesium: 4mg | Net Carbs: 0g
Tried this recipe?Mention @meganellam or tag #madcreations!

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  • Megan says:

    5 stars
    Fool the kids and give them this sugar free ketchup

  • Sarah says:

    Hi Megan I cannot wait to try this recipe šŸ™‚ I was just wondering how long the tomato sauce keeps for please.

    • Megan Mad Creations Hub says:

      Hi Sarah, you can keep it in the fridge in an airtight jar for about a week. If you seal it in smaller jars and only open as needed it will store in the fridge for a lot longer. You can of course freeze some as well.

  • Sarah Morris says:

    Awesome thank you šŸ˜Š

  • Kym S says:

    5 stars
    WINNER! Wow! It’s such an easy recipe (cooked in my Thermie), it’s the perfect consistency, and it’s really delicious. It tastes so much better than any of the no added sugar tomato sauces I’ve ever bought. I have almost 6 cups of sauce and have frozen it in small 1/2 cup portions which will last ages. Thank you for another fabulous recipe.

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