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 Catsup
Ingredients
Directions
Prepare the vegetables
Chop the cucumbers finely and sprinkle with salt. Let them drain overnight.
In the morning, chop the onions finely.
Make the catsup
Mix the cucumbers, onions, mustard seed, celery seed, and ground pepper together. Cover the mixture with cold vinegar.
Transfer to a jar and cover carefully, but do not seal.
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.
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Mustard + celerytop 2% of all pairsSmell alikemoderateCooked together4,169 recipes
Shared aroma: guaiacol (smoky, sweet).
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Cucumber + mustardtop 3% of all pairsSmell alikestrongCooked together2,281 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Celery + peppertop 5% of all pairsSmell alikestrongCooked together16,012 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Onion + mustardtop 6% of all pairsSmell alikestrongCooked together9,259 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Onion + celerytop 7% of all pairsSmell alikemoderateCooked 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
- Provide the bulk of the catsup and release moisture when salted, giving a crisp, fresh texture.
- Onions
- Add sharp, savory flavour and aromatic body to the mixture.
- White mustard seed
- Contributes pungent, sharp flavour that develops as the seeds soften in the vinegar.
- Celery seed
- Adds a warm, earthy aroma that complements the cucumber and onion.
- Cold vinegar
- Provides acidity that preserves the mixture and sharpens its flavour.
The step that matters
Draining the salted cucumbers overnight. Salt draws water out of cucumber by osmosis. Draining well removes that liquid, so the catsup stays thick and crisp rather than watery once it is covered with vinegar.
Swap the onion
How well each one fits the dish's main ingredients (cucumber, mustard, celery, pepper, vinegar):
- Lettucefits better
- Horseradishfits better
- Radishfits better
- Onionthe original
Fit is the average pairing score against cucumber, mustard, celery, 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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