Why it works: Vinegar and horseradish are a kitchen classic. They rank in the top 6% of all ingredient pairs, and 2,588 recipes mention both. Both carry isobutyraldehyde, which smells malty, green. The science ↓
The recipe
Ingredients
Contains: milk, fish, shellfish (auto-detected from the ingredients and method; we can miss things, so check labels)
Also mentioned in the method: butter, oyster
Directions
Prepare
Wash and clean the cod's head thoroughly.
Bind it with tape to prevent the cheeks from breaking.
Boil
Place it in a kettle covered with cold water and add salt, vinegar, and horseradish.
Bring to a boil, then reduce to a simmer, removing scum as it rises.
Boil for about 30 minutes or until the flesh easily separates from the bone.
Drain and serve on a hot napkin, garnished with horseradish, liver, tongue, and roe.
Serve with oyster or cockle sauce and melted butter.
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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Vinegar + horseradishtop 6% of all pairsAroma overlaplowMentioned together2,588 recipes
Shared aroma: isobutyraldehyde (malty, green).
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, with flesh that becomes flaky when cooked.
- Coarse sea salt
- Seasons the cooking water so the fish is seasoned as it poaches.
- Vinegar
- Adds acidity that brightens the flavor of the fish.
- Horseradish
- Contributes a sharp, pungent aroma that complements the rich fish.
The step that matters
Removing scum while simmering. Scum is coagulated protein and impurities that rise as the water heats. Skimming it keeps the broth clear and the flavor clean, and the simmer should stay gentle so the flesh cooks evenly without breaking apart.
“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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