Why it works: Flour and butter are a kitchen classic. They rank in the top 6% of all ingredient pairs, and 122,858 recipes mention both. Both carry isobutyraldehyde, which smells malty, 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
Prepare the fish
Wash the fish and dry it.
Cut the fish into nice pieces, not too small.
Poach the fish
Place the fish in a saucepan with the hot water, vinegar, salt, and peppercorns.
Simmer gently for 10 to 15 minutes, or until fully cooked.
Keep the fish hot.
Make the sauce
Mix the flour and butter to a smooth paste.
Gradually add the fish water, removing the peppercorns.
Boil for 3 minutes while stirring continuously.
Let the sauce cool slightly.
Beat in the egg.
Stir in the parsley.
Pour the 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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Flour + buttertop 6% of all pairsAroma overlaplowMentioned together122,858 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Parsley + buttertop 8% of all pairsAroma overlapmoderateMentioned together28,543 recipes
Shared aroma: trans-2-hexenal (green, leafy).
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Butter + eggtop 8% of all pairsAroma overlapstrongMentioned together118,511 recipes
Shared aroma: nonanal (fat, citrus).
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Flour + eggtop 8% of all pairsAroma overlaplowMentioned together104,138 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + parsleytop 9% of all pairsAroma overlapmoderateMentioned together16,513 recipes
Shared aroma: isobutyraldehyde (malty, green).
Flour and butter 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
- Cod
- Forms the flaky, tender main body of the dish.
- Flour
- Thickens the fish water into a smooth, pourable sauce.
- Butter
- Adds richness and smoothness to the sauce as it forms a paste with the flour.
- Egg
- Enriches the sauce and helps give it a thicker, creamier body when beaten in.
- Vinegar
- Adds a sharp acidity that brightens the mild flavour of the fish.
The step that matters
Adding the egg to the sauce. If the sauce is too hot when the egg goes in, the egg proteins can scramble and turn grainy. Letting the sauce cool slightly first lets the egg thicken it smoothly.
Flavor stand-ins for the parsley
How well each one fits the dish's main ingredients (vinegar, flour, butter, egg):
- Tarragonabout as good a flavor fit
- Parsleythe original
- Nutmegabout as good a flavor fit
- Capersabout as good a flavor fit
Fit is the average pairing score against vinegar, flour, butter, egg. 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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