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Sauce

Tomato Catsup

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

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 10 ingredients
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Why it works: Cinnamon and nutmeg match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 11,917 recipes. Both carry estragole, which smells anise, licorice. The science ↓

Tomato Catsup

Ingredients

Directions

  1. Boil all ingredients together until done.

  2. Bottle and seal when cold.

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. Cinnamon + nutmegtop 1% of all pairs
    Smell alikestrong
    Cooked together11,917 recipes

    Shared aroma: estragole (anise, licorice).

  2. Ginger + cinnamontop 1% of all pairs
    Smell alikestrong
    Cooked together6,380 recipes

    Shared aroma: estragole (anise, licorice).

  3. Ginger + nutmegtop 5% of all pairs
    Smell alikestrong
    Cooked together3,324 recipes

    Shared aroma: estragole (anise, licorice).

  4. Onion + mustardtop 6% of all pairs
    Smell alikestrong
    Cooked together9,259 recipes

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

  5. Cinnamon + mustardtop 7% of all pairs
    Smell alikestrong
    Cooked together1,581 recipes

    Shared aroma: guaiacol (smoky, sweet).

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 bright flavour of the ketchup.
Vinegar
Adds sharp acidity that balances sweetness and helps keep the finished sauce stable.
Brown sugar
Adds sweetness and deepens the flavour of the sauce.
Onions
Contribute savoury aroma and body as they cook down into the sauce.
Ginger
Adds warm, aromatic spice notes.

The step that matters

Boil until done. The record gives no clear sign of doneness. As the sauce boils, water evaporates and it thickens, and the concentration of vinegar and sugar helps preserve it, so it should be cooked until thick rather than just warmed through.

Swap the onion

How well each one fits the dish's main ingredients (tomato, pepper, sugar, ginger, cinnamon, mustard, nutmeg):

  1. Capsicumfits better
  2. Sweet potatofits better
  3. Carrotfits better
  4. Onionthe original

Fit is the average pairing score against tomato, pepper, sugar, ginger, cinnamon, mustard, nutmeg. 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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