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
Place the cleaned cod head in a saucepan with 2 cups of water and ¼ teaspoon of coarse sea salt.
Simmer gently for 2 hours.
Sprinkle in 1 tablespoon of flour and add 1 tablespoon of butter.
Add more water if necessary and simmer for another hour.
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).
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 head
- Releases flavor and collagen into the water, giving the broth body as it simmers.
- Flour
- Starch thickens the broth as it heats, giving it a fuller texture.
- Butter
- Adds fat that carries aroma and gives the broth a richer, rounder mouthfeel.
The step that matters
Adding the flour. Flour sprinkled onto hot liquid can clump, because its starch coats the outside of each particle and blocks water from reaching the rest. Dispersing the flour evenly, for example by whisking it in or mixing it with the butter first, lets the starch hydrate and thicken the broth smoothly.
“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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