Why it works: Lemon and parsley match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and 14,036 recipes mention both. Both carry beta-phellandrene, which smells minty, terpene. The science ↓
The recipe
Ingredients
Contains: fish, shellfish (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Prepare
Tie the head and shoulders of the fish securely.
Place the fish in a kettle and cover it completely with cold water.
Add a handful of coarse sea salt to the water.
Boil and serve
Boil small fish for 20 minutes; large fish for 30 minutes.
Once cooked, drain the fish and remove the string.
Serve garnished with liver, smelt, roe, scraped horseradish, lemon slices, and parsley.
Optionally, serve with fried oysters or small fish and anchovy or oyster sauce.
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 aroma chemistry they share, and how many recipes mention both.
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Lemon + parsleytop 1% of all pairsAroma overlapstrongMentioned together14,036 recipes
Shared aroma: beta-phellandrene (minty, terpene).
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Fish + oystertop 3% of all pairsAroma overlapstrongMentioned together488 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Roe + oystertop 6% of all pairsAroma overlapstrongMentioned together58 recipes
Shared aroma: 2,6-nonadienal (cucumber, green).
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Horseradish + parsleytop 6% of all pairsAroma overlapstrongMentioned together562 recipes
Shared aroma: coumarin (sweet, hay).
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Fish + lemontop 6% of all pairsAroma overlapmoderateMentioned together1,855 recipes
Shared aroma: 2-nonenal (fatty, green).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Cod
- Forms the main body of the dish, cooked gently in water until its flesh turns opaque and flakes.
- Coarse sea salt
- Seasons the cooking water so the fish is lightly flavoured as it poaches.
The step that matters
Keep the water at a gentle boil for the full cooking time. Vigorous boiling toughens and breaks up delicate fish flesh, while timing matters because fish overcooks quickly and becomes dry and rubbery.
Flavor stand-ins for the horseradish
How well each one fits the dish's main ingredients (fish, liver, smelt, roe, lemon, parsley, oyster):
- Potatoabout as good a flavor fit
- Shallotabout as good a flavor fit
- Horseradishthe original
- Tomatoabout as good a flavor fit
Fit is the average pairing score against fish, liver, smelt, roe, lemon, parsley, oyster. Candidates are from the same food group and used in at least 100 recipes. This compares flavor only: it does not check the job the ingredient does in the dish (bulk, moisture, acidity, structure).
“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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