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: fish (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Prepare
Wash and clean the cod's head thoroughly.
Bind it with kitchen twine to prevent the cheeks from breaking.
Boil
Place it in a kettle covered with cold water and add the salt, vinegar, and horseradish.
Bring the water to a boil, then reduce to a simmer, skimming off any scum that rises.
Boil for about 30 minutes for a moderate-sized jowl, longer for larger sizes.
Check if the flesh easily separates from the bone to determine doneness.
Serve
Drain and serve on a hot plate, garnished with scraped horseradish, liver, tongue, and roe.
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, cooked whole so the flesh can be served from the bone.
- Coarse sea salt
- Seasons the cooking water and firms the surface flesh of the fish.
- Vinegar
- Adds acidity to the cooking water, giving the fish a sharper, brighter flavour.
The step that matters
Skimming the simmer. Once the water reaches a boil, it should be reduced to a gentle simmer and scum skimmed as it rises. Rolling boils can break up the delicate flesh and cloud the broth, while skimming removes coagulated proteins that would otherwise dull the flavour and appearance.
“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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