Why it works: Parsley and lemon 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: milk, wheat, fish (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Poach the fish
Boil the pike in a court bouillon made with aromatic herbs.
Make the sauce
Make a roux by melting butter and mixing in flour.
Moisten the roux with the court bouillon.
Add chopped mushrooms, parsley, and green onions; stew well.
Strain the sauce, then mix in essence of anchovy and lemon juice.
Serve
Pour the hot sauce over the fish before serving.
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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Parsley + lemontop 1% of all pairsAroma overlapstrongMentioned together14,036 recipes
Shared aroma: beta-phellandrene (minty, terpene).
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Butter + mushroomtop 3% of all pairsAroma overlapstrongMentioned together12,516 recipes
Shared aroma: trans-2-decenal (waxy, orange).
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Mushroom + oniontop 6% of all pairsAroma overlapstrongMentioned together10,619 recipes
Shared aroma: guaiacol (smoky, sweet).
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Parsley + oniontop 6% of all pairsAroma overlapstrongMentioned together25,834 recipes
Shared aroma: coumarin (sweet, hay).
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Onion + anchovytop 6% of all pairsAroma overlaplowMentioned together1,244 recipes
Shared aroma: 2-methylbutyraldehyde (malty, chocolate).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Pike
- The main fish, cooked gently in the court bouillon until flaky.
- Butter and flour
- Form a roux that thickens the sauce to a smooth, coating consistency.
- Mushrooms
- Add earthy flavour and body to the sauce as they stew.
- Essence of anchovy
- Adds a savoury, salty depth that rounds out the sauce.
- Lemon juice
- Adds acidity that brightens the rich butter sauce.
The step that matters
Strain the sauce before adding the anchovy and lemon. Straining removes cooked herbs and solids so the sauce is smooth, and adding the acidic lemon juice after straining keeps the sauce bright and well balanced.
Flavor stand-ins for the onion
How well each one fits the dish's main ingredients (butter, flour, mushroom, parsley, anchovy, lemon):
- Shallotbetter flavor fit
- Potatobetter flavor fit
- Carrotbetter flavor fit
- Onionthe original
Fit is the average pairing score against butter, flour, mushroom, parsley, anchovy, lemon. 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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Illustration
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