Once you make this homemade tomato sugar free ketchup recipe, youโ€™ll never go back! Itโ€™s got the perfect balance of sweet, tangy, and savory without any added junk. Plus, itโ€™s keto-friendly and ridiculously easy to make with just a few pantry staples. Whether youโ€™re slathering it on burgers or using it as a secret ingredient, this ketchup is a must-try!
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tomato sauce in a white bowl on a brown backdrop

What is Homemade Tomato Ketchup?

Homemade sugar free ketchup is a rich, flavorful sauce made from fresh tomatoes, vinegar, sweetener, and a blend of spices. Unlike store-bought versions, this no sugar added tomato sauce skips the preservatives and unnecessary additives, giving you just the right balance of tang and sweetness. Whether you’re slathering it on burgers, dipping French fries, or using it as a secret ingredient in marinades, making your own ketchup is easier than you think!

Why This Keto Ketchup Recipe is Better Than Others

Multiple cooking methods – Stovetop, Thermomix, Instant Pot, and slow cooker friendly!

No added junk – Free from preservatives, artificial flavours, and high fructose corn syrup. So much better than store bought ketchup.

Customisable – Adjust sweetness, spice, and tanginess to your liking.

Keto & low-carb friendly – Uses low-carb sweeteners without sacrificing taste.

Sugar Free Ketchup Ingredients laid out and labelled so you know what is in the recipe.

The Ingredients

  • Tomatoes – Use fresh, ripe tomatoes for the best flavor. Canned tomatoes work but may need extra cooking time.
  • Sweetener – Gold erythritol sweetener gives a deep caramel-like taste, but allulose or a monk fruit blend can be used.
  • Vinegar – Apple cider vinegar adds brightness, but white vinegar or red wine vinegar can be used.
  • Fire-Roasted Capsicum – Adds smokiness; swap with roasted red bell pepper or smoked paprika.
  • Celery Salt – Enhances flavor but can be replaced with a pinch of sea salt and celery powder.

How To Make Sugar Free Ketchup

Tomato Sauces in a saucepan with basil and garlic beside it.

Step 1. Place all ingredients into a large pot. Cook, stirring occasionally, until the sauce is thick and reduced by one quarter, about 10-15 minutes).

Step 2. 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.

Best Tips for the Perfect Ketchup

Use a high-powered blender – For an ultra-smooth consistency.

Use ripe tomatoes – They bring the best natural sweetness and depth of flavour.

Don’t rush the cooking time – Simmering allows flavours to develop fully.

Sweetener choice matters – Sukrin Gold mimics brown sugar, but allulose works well, too.

Balance acidity and sweetness – Adjust vinegar or sweetener to taste.

Ways to Cook or Make It

Slow Cooker – Let it simmer low and slow for deeper flavor.

Stovetop (Traditional Method) – Simmer all ingredients in a pot, stirring occasionally, until thickened.

Thermomix – Chop, cook, and blend right in the bowl.

Instant Pot (Pressure Cooker) – Quick and easy, locking in flavors with pressure cooking.

Variations of Flavors

Garlic & Herb Ketchup – Add minced roasted garlic and fresh oregano or basil.

Smoky BBQ Ketchup – Add 1 tsp smoked paprika and a splash of Worcestershire sauce.

Spicy Chipotle Ketchup – Blend in 1-2 chipotle peppers in adobo sauce.

Curry Ketchup – Stir in 1 tsp curry powder for a German-style currywurst sauce.

Balsamic Ketchup – Swap apple cider vinegar for balsamic vinegar for a rich, complex flavor.

Frequently Asked Questions

Stored in a sealed jar in the fridge, it lasts up to 4 weeks. For longer storage, freeze in small portions.

Yes, but it requires proper sterilisation and canning processing in a water bath canner to ensure food safety.

Yes, it does. Using low carb sweeteners still allows the sweetness to shine through this homemade tomato sauce. The kids will never know! Shhh! 🤫

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Sugar Free Ketchup drizzled on a plate.

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.

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

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. San Marzano Sauce

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Sugar Free Ketchup drizzled on a plate.

Sugar Free Ketchup Recipe (Tomato Sauce)

Once you make this homemade tomato sugar free ketchup recipe, you’ll never go back! It’s got the perfect balance of sweet, tangy, and savory without any added junk. Plus, it’s keto-friendly and ridiculously easy to make with just a few pantry staples. Whether you’re slathering it on burgers or using it as a secret ingredient, this ketchup is a must-try!
4.98 from 68 votes!
Prep Time: 10 minutes
Cook Time: 50 minutes
Total Time: 1 hour
Course: Condiment, Sauce
Cuisine: American, Australian Keto
Diet: Diabetic, Gluten Free
Recipe Category: Low Carb
Calories: 15kcal
Author: Megan Ellam
Servings: 25 serves
Tap or hover over number to scale ingredients
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Equipment

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Ingredients 

Instructions

CONVENTIONAL METHOD

  • Place all ingredients into a large pot. Cook, stirring occasionally, until the sauce is thick and reduced by one quarter, about 10-15 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.

THERMAL METHOD

  • Place all ingredients into mixer; chop 4 sec/speed 4. Cook 20 min/100°C/speed 2. Puree sauce 1 min/ speed 9. Check consistency, if needed cook a little longer until a ketchup consistency is achieved.

Notes

I have a lot of friends who cannot eat capsicum, so, YES this can be left out.
I use 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.
The sauce can be stored in the refrigerator at length if properly “canned”. Please use Google search for tips if you need them.
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.
 

Your Own Notes

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Nutrition

Serving: 1serve (20g) | Calories: 15kcal | Carbohydrates: 2g | Protein: 1g | Fat: 1g | Saturated Fat: 0.1g | Polyunsaturated Fat: 0.1g | Monounsaturated Fat: 0.4g | Sodium: 362mg | Potassium: 117mg | Fiber: 1g | Sugar: 1g | Vitamin A: 293IU | Vitamin C: 6mg | Calcium: 5mg | Iron: 0.4mg | Magnesium: 5mg | Net Carbs: 1g
Tried this recipe?Mention @meganellam or tag #madcreations!

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14 responses to “Sugar Free Ketchup (Keto Tomato Sauce)”

  1. Marie

    4 stars
    Hi Megan,
    I made this in the Thermomix and ended up with about 1/2 – 1/3 cup.
    I imagine the quantity is supposed to be a lot more than that?

    Reply
  2. Tamara

    4 stars
    Hi Megan, Do you buy or make the Fire Roasted Red Capsicum? I have never used them before.

    Reply
  3. Sharon

    5 stars
    Just made this tonight in my instant pot. Itโ€™s delicious, thank you so much for a great recipe.
    Going to serve this with some keto sausage rolls at the weekend.

    Reply
  4. Nicki G

    Hi Megan, Could you please tell me the weight for tomatoes please. ๐Ÿ™‚

    Reply
    1. Megan Mad Creations Hub

      Sorry Nicki I changed the recipe card to tomato past but it was originally made with 1kg of tomatoes.

      Reply
  5. Hazel

    Hello Megan, thank you for your recipes. Iโ€™d like to make this but I canโ€™t see the weight/ cups of fresh tomato needed. Itโ€™s not listed in the recipe card. Thanks.

    Reply
    1. Megan Mad Creations Hub

      I will have to retest this Hazel. I think I just changed the recipe completely from my original x

      Reply
  6. kerry

    Hi Megan,
    Love your receipes!

    What would be the equivalent volume of passata for those tomatoes?

    Reply
    1. Megan Mad Creations Hub

      The same weight would be fine as passata is usually just tomatoes and salt

      Reply
  7. Kym S

    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.

    Reply
  8. Sarah Morris

    Awesome thank you ๐Ÿ˜Š

    Reply
  9. Sarah

    Hi Megan I cannot wait to try this recipe ๐Ÿ™‚ I was just wondering how long the tomato sauce keeps for please.

    Reply
    1. Megan Mad Creations Hub

      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.

      Reply
  10. Megan

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

    Reply
4.98 from 68 votes (63 ratings without comment)

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