Why it works: Onion and mustard match in chemistry and in kitchens. They rank in the top 6% of all ingredient pairs, and cooks put them together in 9,259 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Green Tomato or Cucumber Pickles
Ingredients
Directions
Prepare
Slice the green tomatoes or cucumbers and the onions.
Sprinkle each layer with coarse sea salt.
Let the mixture sit for 24 hours.
Drain the mixture through a sieve.
Cook
In a kettle, layer the tomatoes, onions, and spices alternately.
Cover with strong vinegar.
Simmer until clear.
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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Onion + mustardtop 6% of all pairsSmell alikestrongCooked together9,259 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Tomato + peppertop 7% of all pairsSmell alikemoderateCooked together17,923 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Vinegar + mustardtop 7% of all pairsSmell alikemoderateCooked together14,067 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Tomato + oniontop 8% of all pairsSmell alikemoderateCooked together20,633 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Mustard + peppertop 9% of all pairsSmell alikemoderateCooked together15,430 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
- Green tomatoes or cucumbers
- Form the bulk of the pickle and soften as they cure and simmer.
- Onions
- Add sweetness and body, softening and blending into the pickle as it cooks.
- Coarse sea salt
- Draws water out of the vegetables during the resting period, firming their texture.
- Strong vinegar
- Provides acidity that preserves the pickle and gives it its sharp flavour.
The step that matters
Simmer until clear. Simmering too briefly leaves the vegetables firm and cloudy; cooking gently until they turn translucent softens their structure and lets the flavours meld.
Swap the tomato
How well each one fits the dish's main ingredients (onion, vinegar, mustard, pepper):
- Horseradishfits better
- Broccolifits better
- Lettucefits better
- Tomatothe original
Fit is the average pairing score against onion, vinegar, mustard, pepper. 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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