Healthy Syn Free Tomato Ketchup

    Beautiful Tomato Ketchup, homemade, less sugar and Syn free when following the Slimming World plan.

    One of the reasons Tomato Ketchup has to be synned is because of the super high sugar content. A 500g bottle of standard tomato ketchup can contain around 100g of sugar. Whereas a 500g carton of passata contains around 22g of sugar. This of course can still be considered as high but as you can see this is a huge reduction in sugar content and as most of you will know I am a strong believe in “sugar makes you fat”.

    This Slimming World friendly Tomato Ketchup not only has a massive reduction in the sugar content, it is also Syn Free! Yes really!!!

    How long will this sauce last?

    Store in an air tight container, or try washing out an old ketchup bottle to store in the fridge. The sauce will last for upto 1 – 2 weeks. Shake regularly to prevent separation.

    This contains Sweetener, should I Syn this sauce?

    In my opinion… No.
    1 level Tablespoon of Granulated sweetener should count as half a syn. 
    I believe because you will not be consuming the entire bottle of sauce in one sitting there is no need to Syn this recipe.
    However if you do wish to be precise and are very close to using your full Syn allowance per day you are welcome to allow half a syn per serving.

    Now that you have the sauce… I think you need something to serve this with. Try a few of our delicious recipes…


    Syn Free Tomato Ketchup

    Slimming World Syns: Zero
    Weight Watchers: Coming Soon
    Calories: 265 for the whole recipe
    Course Side Dish
    Cook Time 25 minutes
    Servings 15


    • 500 g Passata
    • 2 tsp Onion Granules
    • 1 tsp Garlic Granules
    • 2 tsp Celery Salt
    • 1 tsp Mustard Powder
    • 1 tsp Ground White Pepper
    • 2 tbsp Granulated Sweetener
    • 80 ml Balsamic Vinegar
    • 120 ml White Wine Vinegar
    • 2 tbsp Worcestershire Sauce
    • 0.5 tsp Paprika
    • Small Pinch Salt


    • Place all of the ingredients into a small sauce pan.
    • Cover with a lid and allow to simmer on a medium to low heat for 20 – 25 minutes. Stir frequently.
    • Allow to fully cool before placing into an air tight container.
    • Store in the fridge for 1 – 2 weeks. Shake frequently to avoid separation.

    Have you created this recipe?

    Please let me know how it turned out! Leave a comment below or share a photo on Instagram tagging me at @fatgirlskinny__ and the hashtag #fatgirlskinny.


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    9 Responses

    1. Kate says:

      How long does this keep for please and thank you.

    2. I find this really spicey for ketchup. Is there a way to make it a little milder?

    3. evie says:

      There’s now syns in tablespoons of sweetener (half a syn for 1 tbsp) so it’s not syn free anymore!

      • Fatgirlskinny says:

        Hi there, thank you for bringing this to our attention.. the recipe is 3 Level Tsp.. and the info at the top explains…

        “More than 1 Level Tsp of Sweetener is now synned but because you will not be using this all in one sitting we class this as Syn free.. Please limit the usage per day…”

    4. Mechrefite says:

      Just to be clear. By Tsp you mean Tablespoon or else it would be tsp (small t for small spoon)?

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