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Tomato Catsup

A thick tomato sauce made with tomatoes, sugar, salt, pepper, and mustard, cooked until thickened and bottled.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Tomato and pepper are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 17,923 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Tomato Catsup

Ingredients

Directions

Prepare

  1. Wash and chop the tomatoes.

  2. Combine tomatoes, sugar, salt, pepper, and mustard in a large pot.

Cook and bottle

  1. Cook over medium heat, stirring occasionally, until thickened.

  2. Pour into sterilized bottles and seal.

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

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

  2. Pepper + mustardtop 9% of all pairs
    Smell alikemoderate
    Cooked together15,430 recipes

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

  3. Tomato + mustardtop 11% of all pairs
    Smell alikemoderate
    Cooked together2,482 recipes

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

  4. Sugar + mustardtop 19% of all pairs
    Smell alikemoderate
    Cooked together8,424 recipes

    Shared aroma: guaiacol (smoky, sweet).

  5. Sugar + peppertop 32% of all pairs
    Smell alikelow
    Cooked together19,401 recipes

    Shared aroma: 2-nonenal (fatty, green).

Sugar and pepper barely smell alike, yet cooks put them together in 19,401 recipes: they work on texture and structure more than aroma.

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 cooks down into the ketchup.
Sugar
Adds sweetness and helps balance the tomatoes' acidity.
Mustard
Adds a sharp, tangy flavor that complements the tomatoes.

The step that matters

Cook until thickened. Cooking over medium heat while stirring occasionally lets water evaporate slowly and evenly. Stopping too early leaves the sauce thin, while overcooking or scorching at the bottom can make it taste burnt.

Swap the tomato

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

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

Fit is the average pairing score against sugar, pepper, mustard. 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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