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Tomato Catsup

A homemade tomato ketchup made by boiling tomatoes with spices and vinegar.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 ingredients
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Why it works: Clove and nutmeg match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 8,686 recipes. Both carry estragole, which smells anise, licorice. The science ↓

Tomato Catsup

Ingredients

Directions

Prepare the tomatoes

  1. Scald the tomatoes just enough to remove the skin.

  2. Let them stand covered with salt for a day.

  3. Strain thoroughly to remove seeds.

Make the ketchup

  1. Add spices to the strained tomatoes.

  2. Boil the mixture for 30 minutes, then let it cool and settle.

  3. Add the cider vinegar, then bottle and seal tightly.

  4. Store in a cool place.

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. Clove + nutmegtop 1% of all pairs
    Smell alikestrong
    Cooked together8,686 recipes

    Shared aroma: estragole (anise, licorice).

  2. Clove + peppertop 5% of all pairs
    Smell alikestrong
    Cooked together17,451 recipes

    Shared aroma: ethyl octanoate (fruity, wine).

  3. Cider + vinegartop 6% of all pairs
    Smell alikemoderate
    Cooked together3,431 recipes

    Shared aroma: 4-ethyl-2-methoxyphenol (smoky, clove).

  4. Pepper + nutmegtop 7% of all pairs
    Smell alikestrong
    Cooked together13,015 recipes

    Shared aroma: 4'-methylacetophenone (bitter almond).

  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

Ripe tomatoes
Provide the main body, moisture and flavour of the ketchup.
Cider vinegar
Adds acidity that gives the ketchup its sharp tang and helps preserve it.
Cloves
Add warm, aromatic spice flavour to the tomato base.
Black pepper
Adds sharp, aromatic heat to the tomato base.
Nutmeg
Adds warm, sweet aroma to the tomato base.

The step that matters

Strain thoroughly to remove seeds. Seeds and fibrous pulp left in the tomatoes would make the ketchup gritty and uneven in texture. Thorough straining gives a smooth, uniform sauce.

Swap the tomato

How well each one fits the dish's main ingredients (clove, pepper, nutmeg, cider, vinegar):

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

Fit is the average pairing score against clove, pepper, nutmeg, cider, 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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