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Sauce

Tomato Catsup

A thick tomato sauce made by boiling tomatoes with vinegar, spices, onions or garlic, and red peppers, then straining and reducing.

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

  1. Wash and chop the tomatoes, then combine them in a large pot with vinegar, allspice, cloves, black pepper, onions or garlic, salt, and red peppers.

  2. Boil the mixture for a long time, stirring occasionally.

  3. Strain the mixture through a sieve to remove solids.

  4. Return the strained liquid to the pot and boil until it thickens.

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

    Shared aroma: ethyl octanoate (fruity, wine).

  3. Allspice + peppertop 5% of all pairs
    Smell alikestrong
    Cooked together6,395 recipes

    Shared aroma: estragole (anise, licorice).

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

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

  5. Tomato + oniontop 8% of all pairs
    Smell alikemoderate
    Cooked together20,633 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

Tomatoes
Provide the main body, flavor, and liquid that the ketchup is built from.
Vinegar
Adds acidity that sharpens flavor and helps preserve the finished ketchup.
Onions or garlic
Contribute savory aromatic flavor to the cooked sauce.
Red peppers
Add sweetness and a mild, fresh pepper flavor to the sauce.

The step that matters

Boil until it thickens. Long boiling evaporates water so the sauce concentrates and sets to a spoonable thickness. Stopping too early leaves it thin and watery.

Swap the onion

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

  1. Capsicumfits better
  2. Mustardfits better
  3. Carrotfits better
  4. Onionthe original

Fit is the average pairing score against tomato, vinegar, allspice, clove, pepper. 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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