Why it works: Parsley and pepper match in chemistry and in kitchens. They rank in the top 2% of all ingredient pairs, and 34,118 recipes mention both. Both carry 4'-methylacetophenone, which smells bitter almond. 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
Ensure the fish is fresh.
Wash and dry the fish.
Cut the fish into nice-sized pieces, not too small.
Place the fish in a saucepan.
Cover the fish with vinegar and water.
Simmer gently until the bone easily separates from the fish (about 30 minutes).
Carefully remove the fish.
Keep the fish warm on a dish.
Make the sauce
In a bowl, mix the flour, pepper, salt, and butter. Add a little water to form a paste.
Stir the paste into the cooking liquid.
Boil gently for three minutes, stirring constantly.
Let the sauce cool slightly.
Beat the egg and stir it into the sauce.
Add the parsley.
Pour the sauce over the fish.
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 + peppertop 2% of all pairsAroma overlapstrongMentioned together34,118 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Flour + buttertop 6% of all pairsAroma overlaplowMentioned together122,858 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Vinegar + peppertop 6% of all pairsAroma overlapmoderateMentioned together27,805 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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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).
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
- Provides the main protein, which firms and flakes as it cooks.
- Flour
- Thickens the cooking liquid into a smooth sauce when boiled.
- Butter
- Adds richness and a smooth, glossy texture to the sauce.
- Egg
- Enriches and thickens the sauce as it is stirred in off the heat.
- Vinegar
- Adds acidity that brightens the flavour of the fish and sauce.
The step that matters
Stir the egg into the sauce after it cools slightly. If the sauce is too hot when the beaten egg goes in, the egg proteins can scramble into lumps instead of thickening it smoothly. Letting it cool slightly first helps keep the sauce silky.
Flavor stand-ins for the parsley
How well each one fits the dish's main ingredients (vinegar, flour, pepper, butter, egg):
- Parsleythe original
- Tarragonabout as good a flavor fit
Fit is the average pairing score against vinegar, flour, pepper, 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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