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Sauce

Cold Catsup

Cold Catsup is a tomato-based sauce with horseradish, mustard, peppers, onion, celery, cinnamon, sugar, and vinegar.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 11 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 the tomatoes

  1. Chop the peeled tomatoes fine or put them through a hasher.

  2. Let the mixture settle and pour off part of the juice.

Make the ketchup

  1. Add the horseradish, coarse sea salt, ground mustard, red peppers, onion, red pepper, celery, cinnamon, brown sugar, and cider vinegar. Stir well and bottle.

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. Mustard + oniontop 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
Provide the main body and flavor base of the ketchup.
Brown sugar
Adds sweetness and rounds out the sharp, acidic flavors.
Cider vinegar
Adds acidity that gives the ketchup its tang and helps preserve it.
Horseradish
Contributes sharp, pungent heat that gives the ketchup its bite.
Ground mustard
Adds sharpness and pungency that complements the horseradish.

Swap the onion

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

  1. Lettucefits better
  2. Capsicumfits better
  3. Broccolifits better
  4. Onionthe original

Fit is the average pairing score against tomato, horseradish, mustard, pepper, celery, cinnamon, sugar. 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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