Why it works: Potato and parsley match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and 2,855 recipes mention both. Both carry 4'-methylacetophenone, which smells bitter almond. The science ↓
The recipe
Ingredients
Contains: egg, milk, fish (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Prepare
Tie the head and shoulders of the cod securely.
Place the cod in a kettle and cover it completely with cold water.
Add a handful of coarse sea salt to the water.
Cook
Boil the fish. Cook small cod for 20 minutes and large cod for 30 minutes after boiling.
Serve
Serve with boiled potatoes and drawn butter, garnished with parsley.
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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Potato + parsleytop 3% of all pairsAroma overlapstrongMentioned together2,855 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Potato + buttertop 6% of all pairsAroma overlapstrongMentioned together6,445 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Butter + parsleytop 8% of all pairsAroma overlapmoderateMentioned together28,543 recipes
Shared aroma: trans-2-hexenal (green, leafy).
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Butter + saucetop 8% of all pairsAroma overlaplowMentioned together15,317 recipes
Shared aroma: ethanol (alcoholic, ethereal).
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Butter + eggtop 8% of all pairsAroma overlapstrongMentioned together118,511 recipes
Shared aroma: nonanal (fat, citrus).
Butter and sauce share little aroma chemistry, yet 15,317 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
- Main protein; gentle boiling sets its flesh into moist, tender flakes.
- Boiled potatoes
- Starchy base that soaks up butter and makes the plate filling.
- Drawn butter
- Adds richness and fat, giving moisture and flavour to the mild fish.
The step that matters
Timing the boil by size. Cod proteins tighten and dry out when overcooked, so the flesh turns tough and flaky. Timing by the fish's size keeps it moist and tender throughout.
Flavor stand-ins for the potato
How well each one fits the dish's main ingredients (butter, parsley, egg, sauce):
- Shallotabout as good a flavor fit
- Potatothe original
- Chiveabout as good a flavor fit
- Asparagusabout as good a flavor fit
Fit is the average pairing score against butter, parsley, egg, sauce. 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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