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Cucumber Catsup

A cucumber-based ketchup made by grating cucumbers, draining, and mixing with onions, salt, vinegar, and peppers.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Cucumber and onion match in chemistry and in kitchens. They rank in the top 8% of all ingredient pairs, and cooks put them together in 6,050 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Cucumber Catsup

Ingredients

Directions

Prepare the cucumbers

  1. Pare the cucumbers and grate them, removing all seeds.

  2. Place the pulp in a thin muslin bag or cheesecloth and hang it up to drain overnight.

  3. In the morning, discard the liquid that has dripped out.

Make and bottle

  1. Add the minced onions, salt, red peppers, and vinegar to the remaining pulp.

  2. Stir well, then bottle and cork tightly.

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. Cucumber + oniontop 8% of all pairs
    Smell alikestrong
    Cooked together6,050 recipes

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

  2. Cucumber + vinegartop 8% of all pairs
    Smell alikemoderate
    Cooked together4,734 recipes

    Shared aroma: 2-methylbutyl acetate (fruit).

  3. Onion + peppertop 11% of all pairs
    Smell alikemoderate
    Cooked together68,474 recipes

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

  4. Cucumber + peppertop 12% of all pairs
    Smell alikemoderate
    Cooked together5,991 recipes

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

  5. Onion + vinegartop 14% of all pairs
    Smell alikemoderate
    Cooked together18,226 recipes

    Shared aroma: acetic acid (sour, vinegar).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Cucumbers
Their pulp forms the body of the ketchup, and draining removes excess liquid so it thickens.
Vinegar
Provides acidity that preserves the ketchup and gives it its sharp, tangy flavour.
Onions
Add savoury depth and aroma to the sauce.
Red peppers
Add sweetness, colour and a mild pepper flavour.

The step that matters

Draining the cucumber pulp overnight. Cucumbers hold a lot of water. Draining off the liquid before mixing keeps the ketchup thick rather than thin and watery, and removes liquid that could dilute the vinegar and weaken its preserving effect.

Swap the onion

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

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

Fit is the average pairing score against cucumber, vinegar, 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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