Why it works: Onion and pepper are a kitchen classic. They rank in the top 11% of all ingredient pairs, and cooks put them together in 68,474 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Curried Fish
Ingredients
Directions
Make the sauce
In a skillet, melt the butter over medium heat and fry the diced apple and chopped onion until browned.
Stir in the curry powder and flour, then gradually add the fish stock while stirring.
Simmer the mixture slowly for 30 minutes.
Add the vinegar or lemon juice, sugar, salt and pepper, then strain the sauce back into the saucepan.
Finish and serve
Cut the cooked fish into pieces and add to the sauce, heating until hot.
Serve with a border of rice.
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 + peppertop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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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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Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Onion + vinegartop 14% of all pairsSmell alikemoderateCooked together18,226 recipes
Shared aroma: acetic acid (sour, vinegar).
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Vinegar + peppertop 14% of all pairsSmell alikemoderateCooked together27,814 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
Butter and flour 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
- Butter
- Fat that softens and browns the apple and onion, building flavour in the base.
- Flour
- Thickens the curry sauce as it cooks with the stock.
- Curry powder
- Provides the main spiced aroma and flavour of the sauce.
- Apple
- Adds sweetness and body to the sauce as it browns and breaks down.
- Vinegar or lemon juice
- Adds acidity that brightens and balances the rich curry sauce.
The step that matters
Simmering the sauce for 30 minutes. A slow simmer lets the flour fully cook and thicken the stock, removing a raw starchy taste and allowing the curry powder to bloom. Rushing this leaves a thin, floury sauce.
Swap the apple
How well each one fits the dish's main ingredients (fish, butter, onion, flour, sugar, vinegar, pepper):
- Lemonfits better
- Plumfits better
- Coconutfits better
- Applethe original
Fit is the average pairing score against fish, butter, onion, flour, sugar, vinegar, pepper. 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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