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, tree nuts, fish (auto-detected from the ingredients and method; we can miss things, so check labels)
Also mentioned in the method: fish
Directions
Poach the perch
Fill a saucepan with enough cold water to cover the fish, then add chives, parsley, pepper, and salt and bring to a boil.
Wash the perch in lukewarm water to remove slime, empty it, remove gills and fins, and scrape the perch carefully.
Plunge the fish into the boiling water and cook until the flesh gives way when pressed, about 10 minutes for small fish and 30 minutes for large fish.
Drain the fish and place it on a folded napkin, then garnish with curled parsley.
Make the sauce
In a separate pan, mix butter and flour until smooth.
Add milk, chopped parsley, pepper, salt, and nutmeg, then stir over heat until just about to boil.
Pour the sauce into a tureen and add a piece of butter.
Serve hot.
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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Parsley + peppertop 2% of all pairsAroma overlapstrongMentioned together34,118 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Pepper + lemontop 2% of all pairsAroma overlapstrongMentioned together27,039 recipes
Shared aroma: 2-nonenal (fatty, green).
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Butter + milktop 3% of all pairsAroma overlapstrongMentioned together81,222 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Parsley + nutmegtop 3% of all pairsAroma overlapstrongMentioned together5,062 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Perch
- Is the main fish, whose firm flesh becomes flaky when gently poached.
- Fresh butter
- Enriches the sauce with fat, giving it a smooth, rich mouthfeel.
- Flour
- Thickens the butter and milk into a smooth, coating sauce.
- Milk
- Forms the liquid base of the sauce, making it creamy as it thickens.
- Lemon juice
- Adds acidity that brightens the rich butter sauce.
The step that matters
Stir the sauce over heat until just about to boil. Flour thickens milk as it heats, but if the sauce boils hard or is overheated it can turn lumpy or separate, so it should be stopped just short of boiling and kept smooth.
Flavor stand-ins for the chive
How well each one fits the dish's main ingredients (parsley, pepper, butter, flour, milk, nutmeg, lemon):
- Carrotbetter flavor fit
- Potatobetter flavor fit
- Capsicumbetter flavor fit
- Chivethe original
Fit is the average pairing score against parsley, pepper, butter, flour, milk, nutmeg, 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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