Why it works: Butter and milk are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 81,283 recipes. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓
Fish Soup
Ingredients
Directions
Melt the butter in a pan.
Add the flour and stir continuously.
Gradually add the milk while stirring.
Add the fish stock and season with salt and pepper.
Boil for 2 minutes.
Add the cold fish, broken into flakes.
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 their aromas overlap, and how often cooks already put them together.
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Butter + milktop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Fish + buttertop 12% of all pairsSmell alikemoderateCooked together4,488 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Flour + buttertop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Fish + milktop 13% of all pairsSmell alikemoderateCooked together1,432 recipes
Shared aroma: 4-heptenal (creamy, biscuit).
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Flour + milktop 14% of all pairsSmell alikelowCooked together78,219 recipes
Shared aroma: isobutyraldehyde (malty, green).
Flour and butter barely smell alike, yet cooks put them together in 124,287 recipes: they 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
- Flour
- Thickens the butter and milk into a smooth, body-rich base for the soup.
- Butter
- Carries the flour and adds richness and flavour at the start of the soup.
- Milk
- Adds creaminess and moisture, thickened by the flour roux.
- Fish stock
- Provides the main liquid and savoury fish flavour of the soup.
- Cold fish
- Supplies the fish itself, added at the end so it stays in flakes.
The step that matters
Adding the milk gradually while stirring. Adding liquid slowly to the flour and butter while stirring keeps the mixture smooth. Dumping it in at once lets lumps form, because starch clumps before it disperses evenly.
“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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