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Tomato Catsup

A tomato-based condiment made by simmering tomatoes with spices and vinegar.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 8 ingredients
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Why it works: Allspice and clove match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 7,874 recipes. Both carry estragole, which smells anise, licorice. The science ↓

Tomato Catsup

Ingredients

Directions

Prepare the tomatoes

  1. Select good ripe tomatoes.

  2. Scald and strain the tomatoes through a coarse sieve to remove seeds and skins.

Cook and bottle

  1. In a large pot, combine the strained tomatoes with salt, ground mustard, black pepper, allspice, cloves, cayenne pepper, and vinegar.

  2. Simmer slowly for 4 hours.

  3. Bottle and cork tightly.

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 + clovetop 1% of all pairs
    Smell alikestrong
    Cooked together7,874 recipes

    Shared aroma: estragole (anise, licorice).

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

    Shared aroma: methyleugenol (clove, spice).

  3. Pepper + clovetop 5% of all pairs
    Smell alikestrong
    Cooked together17,451 recipes

    Shared aroma: ethyl octanoate (fruity, wine).

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

    Shared aroma: estragole (anise, licorice).

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

Good ripe tomatoes
Provide the main body, sweetness and tomato flavor of the ketchup.
White wine or cider vinegar
Adds acidity that gives the ketchup its tang and helps preserve it.
Coarse sea salt
Seasons the sauce and helps draw out flavor during long simmering.
Ground mustard
Adds sharp, pungent flavor that balances the sweetness of the tomatoes.

The step that matters

Simmer slowly for 4 hours. A long, gentle simmer evaporates water and concentrates the tomato flavor and thickness. Too much heat can scorch the sugars in the tomatoes and make the sauce taste burnt.

Swap the tomato

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

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

Fit is the average pairing score against mustard, pepper, allspice, clove, white wine. 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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