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Sliced-cucumber Catsup

A pickled cucumber condiment made with sliced cucumbers, onions, pepper, salt, red peppers, and boiled vinegar.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 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 ↓

Sliced-cucumber Catsup

Ingredients

Directions

Prepare

  1. Cut cucumbers and onions finely.

  2. Mix with black pepper, coarse sea salt, and red peppers.

Drain and pack

  1. Let the mixture drain overnight.

  2. Pack into glass jars and cover with boiling vinegar.

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
Make up the bulk of the relish, providing crisp, watery texture once cut.
White onions
Add sharpness and savory flavor that balances the sweetness of the vegetables.
Coarse sea salt
Draws water out of the vegetables during draining, concentrating their flavor and firming texture.
Red peppers
Add sweetness, color, and mild heat to the mixture.
Boiling vinegar
Acidifies the mixture, adding tang and helping preserve it in the jars.

The step that matters

Let the mixture drain overnight. Salt pulls water out of the cut vegetables by osmosis. Draining long enough removes excess liquid, so the catsup stays thick rather than watery in the jar.

Swap the onion

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

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

Fit is the average pairing score against cucumber, pepper, vinegar. 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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