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Homemade ketchup

Time: 40 minabout 400 mlapprox. 20 kcal / serving (estimated)

Store-bought ketchup is full of sugar and preservatives, whereas the homemade kind takes twenty minutes of active work and you can tune the flavour yourself: smokier, tangier or less sweet. It's great with burgers, fries and hot dogs.

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Ingredients

Method

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  1. Put all the ingredients in a large, heavy-bottomed saucepan and stir until smooth.
  2. Bring to a boil over medium heat, then turn the heat to its lowest setting and simmer uncovered for 25-30 minutes.
  3. Stir often, because the thickening tomato catches easily and spatters; add a little water if needed.
  4. It's done when it coats the back of a spoon thickly and a line drawn across the bottom of the pan doesn't close up immediately.
  5. Adjust to taste: a little more vinegar for tang, more sugar for sweetness; blitz with a stick blender if you want it perfectly smooth.
  6. Once cooled, pour into a clean jar rinsed with boiling water and store in the fridge.

Source: Wikibooks Cookbook – Tomato Ketchup (CC BY-SA 4.0), adapted and translated. This page is also licensed CC BY-SA 4.0.

Tips

Frequently asked questions

How long does homemade ketchup keep?

About 2 weeks in the fridge in a clean jar, and 2-3 months in the freezer. It has no preservatives, so it spoils sooner than store-bought ketchup.

Why does ketchup need vinegar?

Vinegar provides the characteristic tang and also preserves a little; without it the tomato would taste flat and too sour, which is why both vinegar and sugar are needed.

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