Why it works: Onion and parsley are a kitchen classic. They rank in the top 9% of all ingredient pairs, and cooks put them together in 25,843 recipes. Both carry 2,4-decadienal, which smells seaweed. The science ↓
Salmon Soap
Ingredients
Directions
Prepare
Clean, wash, and dry the salmon, then cut it into 2-inch cubes.
Gently mix the diced onion with the fish and sprinkle salt over all.
Let the mixture stand in a cold place for about 3 hours.
Cook and serve
Put the fish mixture into a stewpan and cover with boiling water.
Boil for about 7 minutes, then add the milk.
When it comes to a boil again, stir in the flour mixed with a little milk.
Add paprika and serve garnished with chopped parsley.
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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Onion + parsleytop 9% of all pairsSmell alikemoderateCooked together25,843 recipes
Shared aroma: 2,4-decadienal (seaweed).
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Flour + parsleytop 12% of all pairsSmell alikemoderateCooked together16,675 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Milk + flourtop 14% of all pairsSmell alikelowCooked together78,219 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Salmon + milktop 16% of all pairsSmell alikelowCooked together1,577 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Onion + flourtop 17% of all pairsSmell alikemoderateCooked together32,460 recipes
Shared aroma: isobutyraldehyde (malty, green).
Milk and flour barely smell alike, yet cooks put them together in 78,219 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
- Salmon
- Provides the main body and flavour of the soup as the fish cooks in the broth.
- Milk
- Adds creaminess and a mild sweetness to the soup's liquid.
- Flour
- Thickens the milk-based liquid as it comes to a boil, giving the soup body.
- Onion
- Adds savoury aroma and sweetness as it sits with the fish and cooks.
The step that matters
Stirring in the flour mixture. Flour mixed with a little milk first disperses evenly; added directly it clumps. Once the liquid reaches a boil again, the starch swells and thickens the soup, so it should be stirred in while the liquid is simmering.
Swap the parsley
How well each one fits the dish's main ingredients (salmon, onion, milk, flour):
- Capersfits better
- Jalapenofits better
- Garlicfits better
- Parsleythe original
Fit is the average pairing score against salmon, onion, milk, flour. Candidates are from the same food group and used in at least 100 recipes.
“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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