Why it works: Fish and lemon are a kitchen classic. They rank in the top 6% of all ingredient pairs, and 1,855 recipes mention both. Both carry 2-nonenal, which smells fatty, green. The science ↓
The recipe
Ingredients
Contains: egg, milk, wheat, fish (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
The book gives no oven temperature. The 350°F (175°C) in the steps was added when the recipe was transcribed, as a starting point.
Poach the fish
Rub the fish with coarse sea salt and place it in a kettle with enough boiling water to cover it.
Once it boils, reduce the heat and let it simmer for 1 hour.
Remove the fish and carefully draw out all the bones.
Make the sauce
In a saucepan, mix 1 ounce of flour with 1 quart of cream or new milk until smooth.
Add the juice of 1 lemon, chopped onion, parsley, nutmeg, salt, and pepper.
Cook the mixture over heat, stirring until it thickens.
Stir in ¼ pound of butter and strain the sauce through a sieve.
Assemble and bake
Place a little sauce on a dish, lay the fish on top, and pour the remaining sauce over it.
Beat the whites of 6 eggs until frothy and spread them over the fish.
Bake at 350°F (175°C) for 30 minutes or until light brown.
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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Fish + lemontop 6% of all pairsAroma overlapmoderateMentioned together1,855 recipes
Shared aroma: 2-nonenal (fatty, green).
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Lemon + parsleytop 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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Lemon + peppertop 2% of all pairsAroma overlapstrongMentioned together27,039 recipes
Shared aroma: 2-nonenal (fatty, green).
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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
- Flour
- Thickens the cream into a smooth, pourable sauce as it cooks.
- Cream or new milk
- Forms the rich base of the sauce and gives it a smooth, creamy texture.
- Butter
- Adds fat and richness, giving the finished sauce a silkier mouthfeel.
- Whites of eggs
- Whipped to a froth, they set in the oven to form a light, browned topping.
- Lemon juice
- Adds acidity that brightens the cream sauce and balances its richness.
The step that matters
Beat the egg whites until frothy. Egg whites hold air when beaten, and the foam sets as it heats, forming the topping. Under-beaten whites stay runny and slide off, while over-beaten whites turn dry and grainy.
Flavor stand-ins for the onion
How well each one fits the dish's main ingredients (fish, flour, cream, lemon, parsley, nutmeg, pepper):
- Carrotbetter flavor fit
- Potatobetter flavor fit
- Spinachbetter flavor fit
- Onionthe original
Fit is the average pairing score against fish, flour, cream, lemon, parsley, nutmeg, pepper. 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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