Why it works: Onion and leek match in chemistry and in kitchens. They rank in the top 4% of all ingredient pairs, and cooks put them together in 1,326 recipes. Both carry ethyl butyrate, which smells apple, fruity. The science ↓
Conger-eel
Ingredients
Directions
In a stewpan, combine water and white wine; add parsley and bring to a boil for 25 minutes.
Strain the broth through a sieve.
Slice the onion and leek, then fry them in butter.
Add the drained turbot pieces, season lightly with salt, and fry for a few minutes.
Sprinkle with flour and curry powder, toss, and gradually add the prepared broth.
Bring to a boil, then reduce heat and cook for 15 minutes.
Remove the fish with a skimmer, debone, and skin it, then place in a soup tureen.
Thicken the soup with egg yolks mixed with cream, strain, and finish with butter before pouring into the tureen.
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 + leektop 4% of all pairsSmell alikestrongCooked together1,326 recipes
Shared aroma: ethyl butyrate (apple, fruity).
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Parsley + leektop 4% of all pairsSmell alikestrongCooked together759 recipes
Shared aroma: trans-2-hexenal (green, leafy).
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Leek + flourtop 8% of all pairsSmell alikestrongCooked together328 recipes
Shared aroma: isobutyraldehyde (malty, green).
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White wine + buttertop 9% of all pairsSmell alikemoderateCooked together5,083 recipes
Shared aroma: ethyl octanoate (fruity, wine).
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Parsley + oniontop 9% of all pairsSmell alikemoderateCooked together25,843 recipes
Shared aroma: 2,4-decadienal (seaweed).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
Swap the onion
How well each one fits the dish's main ingredients (white wine, parsley, leek, butter, turbot, flour, egg):
- Shallotfits better
- Chivefits better
- Asparagusfits better
- Onionthe original
Fit is the average pairing score against white wine, parsley, leek, butter, turbot, flour, egg. Candidates are from the same food group and used in at least 100 recipes.
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