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Sauce

Cold Catsup

A cold tomato-based sauce with onions, peppers, sugar, vinegar, horseradish, mustard, celery seed, and salt.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 10 ingredients
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Why it works: Horseradish and mustard match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 1,832 recipes. Both carry coumarin, which smells sweet, hay. The science ↓

Cold Catsup

Ingredients

Directions

Prepare

  1. Peel and chop the tomatoes finely, then squeeze out the juice.

  2. Add the chopped onions and green peppers to the tomato juice.

Season and mix

  1. Stir in the sugar, vinegar, grated horseradish, black mustard, white mustard, celery seed, and salt.

  2. Mix well and adjust seasoning to taste.

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. Horseradish + mustardtop 1% of all pairs
    Smell alikestrong
    Cooked together1,832 recipes

    Shared aroma: coumarin (sweet, hay).

  2. Mustard + celerytop 2% of all pairs
    Smell alikemoderate
    Cooked together4,169 recipes

    Shared aroma: guaiacol (smoky, sweet).

  3. Tomato + celerytop 4% of all pairs
    Smell alikemoderate
    Cooked together3,377 recipes

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

  4. Pepper + celerytop 5% of all pairs
    Smell alikestrong
    Cooked together16,012 recipes

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

  5. Onion + mustardtop 6% of all pairs
    Smell alikestrong
    Cooked together9,259 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
Form the bulk of the ketchup and provide its main liquid and body.
Sugar
Adds sweetness that balances the acidity of the vinegar.
Vinegar
Provides acidity that gives the ketchup its tang and helps preserve it.
Onions
Add savory depth and aroma to the tomato base.
Black mustard
Adds sharp, pungent flavor to the sauce.

Swap the tomato

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

  1. Broccolifits better
  2. Lettucefits better
  3. Beetrootfits better
  4. Tomatothe original

Fit is the average pairing score against onion, pepper, sugar, vinegar, horseradish, mustard, celery. 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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