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Tomato Catsup

A tomato-based condiment made by boiling tomatoes and peppers, seasoning, and adding vinegar.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 8 ingredients
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Why it works: Allspice and mustard 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. Boil the tomatoes and red peppers for 1 hour.

  2. Strain the mixture through a colander and sieve.

  3. Add salt, black pepper, allspice, mustard, and chopped onions.

  4. Boil until thoroughly cooked.

  5. Add vinegar to achieve the desired consistency.

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. Allspice + mustardtop 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. Mustard + oniontop 6% of all pairs
    Smell alikestrong
    Cooked together9,259 recipes

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

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

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

  5. Mustard + vinegartop 7% of all pairs
    Smell alikemoderate
    Cooked together14,067 recipes

    Shared aroma: isobutyraldehyde (malty, green).

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

What each ingredient does

Tomatoes
Provide the main body, moisture and tomato flavour that the sauce is built on.
Red peppers
Add sweetness and vegetable flavour alongside the tomatoes.
Onions
Contribute savoury depth and aroma as they cook down into the sauce.
Vinegar
Adds acidity that brightens the flavour and helps preserve the sauce.

The step that matters

Boil until thoroughly cooked. The sauce must cook long enough for the vegetables to soften fully and the mixture to thicken. Under-cooked ketchup stays watery and tastes raw, and it is less stable in storage.

Swap the tomato

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

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

Fit is the average pairing score against pepper, allspice, mustard, onion, vinegar. 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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