Why it works: Tomato and onion are a kitchen classic. They rank in the top 8% of all ingredient pairs, and cooks put them together in 20,633 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Curry -sauce
Ingredients
Directions
Melt the butter in a saucepan.
Fry the onion until lightly browned.
Add the flour and curry powder, stir, and cook gently for a few minutes.
Add the stock and bring to a boil.
Stir in the tomato and season with salt.
Simmer gently for 20 minutes, then strain and serve.
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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Tomato + oniontop 8% of all pairsSmell alikemoderateCooked together20,633 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Butter + oniontop 15% of all pairsSmell alikemoderateCooked together42,912 recipes
Shared aroma: decanal (soap, orange peel).
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Flour + oniontop 17% of all pairsSmell alikemoderateCooked together32,460 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Butter + tomatotop 22% of all pairsSmell alikemoderateCooked together6,918 recipes
Shared aroma: 3-hexenal (apple, fruity).
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
- Carries the onion and spices and adds richness to the sauce.
- Flour
- Thickens the stock into a smooth sauce as it cooks with the butter.
- Curry powder
- Provides the main spiced flavor, which blooms when briefly cooked in fat.
- Stock
- Forms the liquid base of the sauce.
- Tomato
- Adds acidity and body to balance the curry spices.
The step that matters
Cook the flour and curry powder gently. Stirring the flour and spices over gentle heat for a few minutes cooks out the raw flour taste and blooms the curry flavor in fat. Skipping this leaves the sauce tasting floury and dusty, and it can lump when the stock is added.
Swap the tomato
How well each one fits the dish's main ingredients (butter, flour, onion):
- Chivefits better
- Leekfits better
- Shallotfits better
- Tomatothe original
Fit is the average pairing score against butter, flour, onion. 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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