Slow cooker homemade tomato ketchup

    12 hours 10 min

    This ketchup actually comes close to the big brands in terms of taste, texture and colour. Using a slow cooker, this thick and tasty tomato ketchup practically cooks itself.

    73 people made this

    Serves: 48 

    • 1.6L pureed tomatoes
    • 120ml water
    • 125g granulated sugar
    • 180ml white vinegar
    • 1 teaspoon onion granules
    • 1/2 teaspoon garlic powder
    • 1 3/4 teaspoons salt
    • 1/8 teaspoon celery salt
    • 1/8 teaspoon mustard powder
    • 1/4 teaspoon finely ground black pepper
    • 1 whole clove

    Prep:10min  ›  Cook:12hr  ›  Ready in:12hr10min 

    1. Pour pureed tomatoes into slow cooker. Swirl water in empty tomato jars/cartons and pour into slow cooker. Add sugar, vinegar, onion powder, garlic powder, salt, celery salt, mustard powder, black pepper, cayenne pepper and whole clove; whisk to combine.
    2. Cook on high, uncovered, until mixture is reduced by half and very thick, 10 to 12 hours. Stir every hour or so.
    3. Smooth the texture of the ketchup using an immersion blender, about 20 seconds.
    4. Ladle the ketchup into a fine sieve and press mixture with the back of a ladle to strain out any skins and seeds.
    5. Transfer the strained ketchup to a bowl. Cool completely before tasting to adjust salt, black pepper or cayenne pepper.

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    Reviews in English (94)


    Am amazed! This is excellent! I didn’t tweak the recipe - used slightly less sugar (I ran out!) and I used about 1/2 a tsp of cayenne (the ingredients list doesn’t tell you how much to use). Cooked it for 10 hours, then let it cool and it’s a perfect consistency. Will certainly do this again. Highly recommended. Thank you.  -  13 May 2018


    Wow! This recipe came out great. I have two little kids and wanted to make a ketchup without high fructose corn syrup, and to use in our homemade BBQ and sloppy joe sauces. It tastes just like the bottled stuff. I skipped the white sugar & put in 1/3 c of honey instead, to make it even less processed. Canned crushed tomatoes made it easier to strain at the end, and the consistency is pretty good. I would skip the added water next time when using the honey. This is a keeper! I'm so excited that I found this recipe & it was so easy using the slow cooker.  -  30 Jan 2014  (Review from Allrecipes US | Canada)


    This turned out great! I used minced green onions, garlic, and celery instead of the garlic powder, onion powder, and celery salt. I didn't puree it because I kind of like the chunky consistency. I think next time I will try peeled pureed tomatoes and cut the sugar a bit. All in all, easy and delicious!  -  20 May 2013  (Review from Allrecipes US | Canada)