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Tomato Catsup

A thick tomato sauce made with tomatoes, vinegar, peppers, salt, pepper, mustard, and allspice, simmered for hours.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 ingredients
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Why it works: Mustard and allspice match in chemistry and in kitchens. They rank in the top 2% of all ingredient pairs, and cooks put them together in 1,928 recipes. Both carry methyleugenol, which smells clove, spice. The science ↓

Tomato Catsup

Ingredients

Directions

  1. Combine all ingredients in a large pot.

  2. Bring to a boil over medium heat.

  3. Reduce heat and simmer for 4 hours, stirring occasionally.

Recipe from a historical cookbook (Internet Archive).

Transcribed from a scanned cookbook and modernised for today's kitchens. Where the book gave no heat or time, or said "a moderate oven", the temperatures and times here may be modern equivalents rather than the book's own figures.

Explore the science

The flavor team

The pairs that carry this dish. Each one is judged two ways: how much their aromas overlap, and how often cooks already put them together.

  1. Mustard + allspicetop 2% of all pairs
    Smell alikestrong
    Cooked together1,928 recipes

    Shared aroma: methyleugenol (clove, spice).

  2. Pepper + allspicetop 5% of all pairs
    Smell alikestrong
    Cooked together6,395 recipes

    Shared aroma: estragole (anise, licorice).

  3. Tomato + peppertop 7% of all pairs
    Smell alikemoderate
    Cooked together17,923 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  4. Vinegar + mustardtop 7% of all pairs
    Smell alikemoderate
    Cooked together14,067 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  5. Pepper + mustardtop 9% of all pairs
    Smell alikemoderate
    Cooked together15,430 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Peeled tomatoes
Provide the main body, moisture and sweet-tart flavour of the ketchup.
Vinegar
Adds acidity that gives the ketchup its tang and helps preserve it.
Red peppers
Contribute sweetness, colour and a mild vegetal flavour to the sauce.
Mustard
Adds sharpness and pungency that balances the sweetness of the tomatoes.

The step that matters

Simmering for 4 hours. Long, gentle simmering with occasional stirring evaporates water and concentrates flavour. Stirring prevents the thick sauce from scorching on the bottom of the pot.

Swap the tomato

How well each one fits the dish's main ingredients (vinegar, pepper, mustard, allspice):

  1. Horseradishfits better
  2. Radishfits better
  3. Shallotfits better
  4. Tomatothe original

Fit is the average pairing score against vinegar, pepper, mustard, allspice. Candidates are from the same food group and used in at least 100 recipes.

“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.

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