Why it works: Flour and butter are a kitchen classic. They rank in the top 6% of all ingredient pairs, and 122,858 recipes mention both. Both carry isobutyraldehyde, which smells malty, green. The science ↓
The recipe
Ingredients
Contains: milk, wheat, fish (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Prepare
Remove the gills and blood from the cod's head and wash it well.
Place the cod's head on a plate.
Boil and skin
In boiling water, add 2 handfuls of coarse sea salt and ½ pint of vinegar.
Add the cod's head to the boiling water; it will take about 1 hour to cook.
Once cooked, remove it and gently strip off the skin.
Finish and serve
Dredge the cod's head with flour and place lumps of butter on top.
If desired, place it in the oven until browned; use a salamander if necessary.
Prepare gravy sauce and serve it with the cod's head.
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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Flour + buttertop 6% of all pairsAroma overlaplowMentioned together122,858 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Butter + saucetop 8% of all pairsAroma overlaplowMentioned together15,317 recipes
Shared aroma: ethanol (alcoholic, ethereal).
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Flour + saucetop 13% of all pairsAroma overlapmoderateMentioned together7,622 recipes
Shared aroma: ethanol (alcoholic, ethereal).
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Vinegar + buttertop 14% of all pairsAroma overlapmoderateMentioned together13,453 recipes
Shared aroma: isoamyl acetate (banana, pear).
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Vinegar + saucetop 18% of all pairsAroma overlaplowMentioned together3,842 recipes
Shared aroma: ethanol (alcoholic, ethereal).
Flour and butter share little aroma chemistry, yet 122,858 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's head
- Forms the main body of the dish, cooked gently in the seasoned water until tender.
- Flour
- Dusting on the surface that helps the skin and fish brown lightly when heated.
- Butter
- Melts over the surface, adding richness and helping the top brown in the oven.
- Vinegar
- Adds a sharp acidity to the cooking water that brightens the mild flavour of the fish.
The step that matters
Boiling the cod's head. The head must be simmered in the salted, acidic water until fully cooked but not allowed to fall apart, since overcooking makes the flesh dry and flaky in the wrong way.
“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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