Why it works: Pepper and lemon match in chemistry and in kitchens. They rank in the top 2% of all ingredient pairs, and 27,039 recipes mention both. Both carry 2-nonenal, which smells fatty, green. The science ↓
The recipe
Ingredients
Contains: 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 400°F (200°C) in the steps was added when the recipe was transcribed, as a starting point.
Make the filling
In a saucepan, melt the butter and fry the onions until browned.
Stir in the flour and add boiling water, mixing until smooth.
Add the soaked cod sounds, season with pepper, white wine, and lemon juice, and stir well.
Bake and serve
Transfer the mixture to a pie dish, cover with puff pastry, and bake at 400°F (200°C) for one hour.
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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Pepper + lemontop 2% of all pairsAroma overlapstrongMentioned together27,039 recipes
Shared aroma: 2-nonenal (fatty, green).
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Butter + white winetop 3% of all pairsAroma overlapstrongMentioned together5,039 recipes
Shared aroma: ethyl octanoate (fruity, wine).
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White wine + lemontop 4% of all pairsAroma overlapmoderateMentioned together3,764 recipes
Shared aroma: myrcene (balsamic, herbaceous).
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Onion + white winetop 5% of all pairsAroma overlapmoderateMentioned together4,426 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Butter + flourtop 6% of all pairsAroma overlaplowMentioned together122,858 recipes
Shared aroma: isobutyraldehyde (malty, green).
Butter and flour share little aroma chemistry, yet 122,858 recipes mention both: they likely work on texture and structure more than aroma.
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Butter
- Fat that cooks the onions and adds richness and flavour to the filling.
- Onions
- Browning builds savoury, sweet flavour in the base of the filling.
- Flour
- Thickens the boiling water into a smooth sauce that holds the filling together.
- Cod sounds
- Main protein, which becomes tender and flaky as it cooks in the sauce.
- White wine
- Adds acidity and aroma that brighten the rich sauce.
- Puff pastry
- Rises and browns in the oven to form a crisp, flaky crust over the filling.
The step that matters
Stir the flour into the onions and water until smooth. Lumps of flour stay dry and floury in the sauce. Stirring the flour into the fat and cooking it, then adding liquid gradually, helps it disperse and thicken evenly.
Flavor stand-ins for the onion
How well each one fits the dish's main ingredients (butter, flour, pepper, white wine, lemon):
- Capsicumbetter flavor fit
- Shallotbetter flavor fit
- Potatobetter flavor fit
- Onionthe original
Fit is the average pairing score against butter, flour, pepper, white wine, 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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