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Cucumber Ketchup

A pickled cucumber condiment seasoned with salt, pepper, mustard seeds, celery seed, onion, and vinegar.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 8 ingredients
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Why it works: Mustard and celery are a kitchen classic. They rank in the top 2% of all ingredient pairs, and cooks put them together in 4,169 recipes. Both carry guaiacol, which smells smoky, sweet. The science ↓

Cucumber Ketchup

Ingredients

Directions

Prepare

  1. Cut cucumbers into small pieces or grate them.

  2. Sprinkle with coarse sea salt and let stand for 24 hours.

  3. Strain off the water.

Season and serve

  1. Add a pinch of black pepper, some black and white mustard seeds, celery seed, and chopped onion.

  2. Cover with vinegar and it's ready for use.

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

    Shared aroma: guaiacol (smoky, sweet).

  2. Cucumber + mustardtop 3% of all pairs
    Smell alikestrong
    Cooked together2,281 recipes

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

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

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

  4. Mustard + oniontop 6% of all pairs
    Smell alikestrong
    Cooked together9,259 recipes

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

  5. Celery + oniontop 7% of all pairs
    Smell alikemoderate
    Cooked together18,518 recipes

    Shared aroma: guaiacol (smoky, sweet).

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

What each ingredient does

Cucumbers
Form the bulk of the ketchup and provide its fresh, watery texture.
Coarse sea salt
Draws water out of the cucumbers, concentrating their flavor and firming the pieces.
Vinegar
Adds acidity that sharpens the flavor and helps preserve the ketchup.
Onion
Adds pungent, savory depth that balances the cucumber's mildness.

The step that matters

Strain off the water. Salting draws out liquid from the cucumbers. Pouring off that water before adding vinegar keeps the ketchup thick and prevents it from becoming diluted and runny.

Swap the onion

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

  1. Lettucefits better
  2. Horseradishfits better
  3. Radishfits better
  4. Onionthe original

Fit is the average pairing score against cucumber, pepper, mustard, celery, 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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