Why it works: Parsley and lemon match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and 14,036 recipes mention both. Both carry beta-phellandrene, which smells minty, terpene. The science ↓
The recipe
Ingredients
Contains: fish (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Prepare the fish
Rub a little salt down the bone and thick part of the fish.
Tie a fold or two of wide tape around it to prevent breaking.
Place it in a fish kettle with enough cold water to cover it and add salt.
Add vinegar and horseradish to the water.
Poach
Bring the water just to the verge of boiling, then reduce heat to simmer gently until the fish is done.
Check doneness by trying to separate the meat from the bone with a fish slice.
Skim the water well and carefully drain the fish.
Serve
Slip the fish onto a neatly folded napkin in a dish.
Garnish with double parsley, lemon, and the roe and liver of the cod.
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 + lemontop 1% of all pairsAroma overlapstrongMentioned together14,036 recipes
Shared aroma: beta-phellandrene (minty, terpene).
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Horseradish + parsleytop 6% of all pairsAroma overlapstrongMentioned together562 recipes
Shared aroma: coumarin (sweet, hay).
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Vinegar + horseradishtop 6% of all pairsAroma overlaplowMentioned together2,588 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Horseradish + lemontop 8% of all pairsAroma overlapmoderateMentioned together1,155 recipes
Shared aroma: coumarin (sweet, hay).
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Parsley + livertop 9% of all pairsAroma overlapmoderateMentioned together1,095 recipes
Shared aroma: linalool (floral, citrus).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Cod's head and shoulders
- Forms the main body of the dish, cooked gently until the meat separates from the bone.
- Vinegar
- Adds a slight acidity to the poaching water, brightening the flavour of the fish.
The step that matters
Simmering the fish gently. Once the water reaches a gentle simmer, a hard boil can break the delicate flesh apart and make it dry and tough. Keeping the heat low cooks the fish evenly and keeps it moist and intact until it is done.
Flavor stand-ins for the horseradish
How well each one fits the dish's main ingredients (vinegar, parsley, lemon, roe, liver):
- Shallotbetter flavor fit
- Carrotbetter flavor fit
- Potatobetter flavor fit
- Horseradishthe original
Fit is the average pairing score against vinegar, parsley, lemon, roe, liver. 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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