Why it works: Parsley and parsnip match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and 484 recipes mention both. Both carry myristicin, which smells spice, warm. 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 the cod
Cut fresh cod into slices or steaks.
Soak the cod in a mixture of salt and water for 3 hours, adding vinegar.
Boil, fry, or broil the cod as desired.
For dry salted fish, cut into square pieces or soak a large piece in cold water overnight.
Cook and clean the fish
Wash the fish in fresh water and boil in cold water for 1.5 hours.
Cool the fish in the water, then remove it and pick out the bones.
Scrape the fish clean without removing the skin.
Boil the fish again in boiling water, adding salt if it's too fresh, for 1 to 1.5 hours.
Serve
Garnish with hard-boiled eggs and parsley, and serve with boiled parsnips and egg sauce.
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 + parsniptop 3% of all pairsAroma overlapstrongMentioned together484 recipes
Shared aroma: myristicin (spice, warm).
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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 + saucetop 8% of all pairsAroma overlaplowMentioned together15,317 recipes
Shared aroma: ethanol (alcoholic, ethereal).
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Egg + buttertop 8% of all pairsAroma overlapstrongMentioned together118,511 recipes
Shared aroma: nonanal (fat, citrus).
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Vinegar + parsleytop 9% of all pairsAroma overlapmoderateMentioned together6,477 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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
- The main protein; its flesh flakes and firms as it cooks, giving the dish its structure.
- Vinegar
- Adds acidity to the soaking liquid, sharpening the flavour of the cod.
- Butter
- Enriches the egg sauce with fat, giving it a smooth, rich texture.
The step that matters
Re-boiling the salted fish. Soaking and boiling draw salt out of the fish, so timing controls how salty it ends up. Boiling too hard or too long can toughen the proteins and dry the flesh. Taste a small piece before deciding whether to add salt.
Flavor stand-ins for the parsnip
How well each one fits the dish's main ingredients (vinegar, egg, parsley, butter, sauce):
- Shallotbetter flavor fit
- Capsicumbetter flavor fit
- Potatobetter flavor fit
- Parsnipthe original
Fit is the average pairing score against vinegar, egg, parsley, butter, 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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