Why it works: Cucumber and mustard match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and cooks put them together in 2,281 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Cucumber Catsup
Ingredients
Directions
Sprinkle salt over chopped cucumbers and onions.
Place in a colander with a weight on top and let drain overnight.
Add white mustard to the drained mixture.
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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Cucumber + mustardtop 3% of all pairsSmell alikestrongCooked together2,281 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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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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Cucumber + oniontop 8% of all pairsSmell alikestrongCooked together6,050 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
- Cucumbers
- Form the bulk of the catsup, and salting draws out their water for a firmer texture.
- Onions
- Add sharp, savoury aroma and bite to the mixture.
- Coarse sea salt
- Draws water out of the vegetables by osmosis, firming them and seasoning the mixture.
- White mustard
- Adds pungent, tangy flavour that gives the catsup its characteristic bite.
The step that matters
Draining overnight under a weight. Salt draws water out of the cucumbers and onions through osmosis, and the weight presses out more liquid. If the mixture is not drained well, the finished catsup stays watery and loose rather than thick.
Swap the onion
How well each one fits the dish's main ingredients (cucumber, mustard):
- Horseradishfits better
- Lettucefits better
- Radishfits better
- Onionthe original
Fit is the average pairing score against cucumber, mustard. 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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