Why it works: Apple and cider are a kitchen classic. They rank in the top 2% of all ingredient pairs, and cooks put them together in 1,238 recipes. Both carry 1-octen-3-one, which smells mushroom, metallic. The science ↓
Cucumber Relish
Ingredients
Directions
Prepare
Cut the cucumbers lengthwise into ½‑inch thick slices.
Slice the onions thinly.
Pack the cucumbers and onions in layers in a preserving pan with salt and let stand overnight.
In the morning, pour off the liquid.
Cook and pack
Add apple cider and cider vinegar, and cook for 15 minutes.
Optionally, sweeten the vinegar with sugar and add bay leaves while cooking, but remove them before packing.
Pack the mixture in an earthenware jar, sprinkling mustard seeds over each layer.
Pour the juice over the packed relish.
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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Apple + cidertop 2% of all pairsSmell alikemoderateCooked together1,238 recipes
Shared aroma: 1-octen-3-one (mushroom, metallic).
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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).
-
Cider + vinegartop 6% of all pairsSmell alikemoderateCooked together3,431 recipes
Shared aroma: 4-ethyl-2-methoxyphenol (smoky, clove).
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Vinegar + mustardtop 7% of all pairsSmell alikemoderateCooked together14,067 recipes
Shared aroma: isobutyraldehyde (malty, green).
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 and provide its crisp, fresh texture.
- Onions
- Add pungency and sweetness that mellow during cooking.
- Coarse sea salt
- Draws water out of the cucumbers and onions, firming them and reducing liquid.
- Apple cider
- Provides liquid and a fruity tang for the cooking syrup.
- Cider vinegar
- Adds acidity that sharpens flavour and helps preserve the relish.
The step that matters
Pouring off the liquid after salting overnight. Salt draws a large volume of water out of the vegetables. Pouring it off fully before cooking keeps the relish from becoming watery and diluting the vinegar brine.
Swap the onion
How well each one fits the dish's main ingredients (cucumber, apple, cider, vinegar, sugar, mustard):
- Horseradishfits better
- Radishfits better
- Lettucefits better
- Onionthe original
Fit is the average pairing score against cucumber, apple, cider, vinegar, sugar, 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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