Why it works: Cider and vinegar are a kitchen classic. They rank in the top 6% of all ingredient pairs, and cooks put them together in 3,431 recipes. Both carry 4-ethyl-2-methoxyphenol, which smells smoky, clove. The science ↓
Cucumber Catsup
Ingredients
Directions
Prepare the cucumbers
Peel and remove seeds from cucumbers.
Cut cucumbers lengthwise and grate or slice thin.
Place cucumber pulp in a jelly bag and drain overnight.
Squeeze out excess liquid in the morning.
Make the ketchup
Chop onions and green peppers.
Add onions, green peppers, and salt to cucumber pulp.
Thin mixture with cider vinegar. Mix well.
Store
Transfer to airtight jars for storage.
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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Cider + vinegartop 6% of all pairsSmell alikemoderateCooked together3,431 recipes
Shared aroma: 4-ethyl-2-methoxyphenol (smoky, clove).
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Cucumber + oniontop 8% of all pairsSmell alikestrongCooked together6,050 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Cucumber + vinegartop 8% of all pairsSmell alikemoderateCooked together4,734 recipes
Shared aroma: 2-methylbutyl acetate (fruit).
-
Onion + peppertop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Cucumber + peppertop 12% of all pairsSmell alikemoderateCooked together5,991 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
- Make up the bulk of the ketchup and provide its watery, fresh body.
- Cider vinegar
- Adds acidity that gives the ketchup its tang and helps keep it stable in storage.
- Onions
- Add savory flavor and aroma to the ketchup base.
- Green peppers
- Add fresh, slightly bitter vegetable flavor and body.
The step that matters
Squeeze out excess liquid in the morning. Cucumbers are mostly water. Removing excess liquid before adding vinegar keeps the ketchup thick rather than runny and concentrates the flavor.
Swap the onion
How well each one fits the dish's main ingredients (cucumber, pepper, cider, vinegar):
- Mustardfits better
- Capsicumfits better
- Radishfits better
- Onionthe original
Fit is the average pairing score against cucumber, pepper, cider, 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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