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 of Kidney Beans
Ingredients
Directions
Prepare the beans
Wash and soak the kidney beans overnight.
Drain the beans, cover with water, and boil for 30 minutes.
Drain again, cover with boiling water, and boil gently for 3 hours or until tender.
Make the sauce
In a saucepan, melt the butter and drippings, then add the minced onion and cook until soft.
Stir in the flour, curry powder, and cloves to make a sauce.
Combine and serve
Pour the sauce over the beans and simmer for 10 minutes.
Serve hot.
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).
-
Clove + tomatotop 12% of all pairsSmell alikemoderateCooked together3,474 recipes
Shared aroma: ethyl caproate (fruity, apple peel).
-
Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Kidney beans + tomatotop 12% of all pairsSmell alikemoderateCooked together821 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Clove + oniontop 13% of all pairsSmell alikemoderateCooked together16,901 recipes
Shared aroma: 2-nonanone (fruity, floral).
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
- Kidney beans
- Provide the main body and texture of the curry once fully tender.
- Onion
- Softens and adds sweetness and savoury base flavour to the sauce.
- Flour
- Thickens the sauce as it cooks with the fat.
- Butter
- Carries flavour and adds richness to the sauce.
- Tomato
- Adds acidity and body to the sauce.
The step that matters
Boiling the beans until tender. Dried kidney beans must be soaked and boiled thoroughly, since undercooked kidney beans contain lectins that are harmful and can cause stomach upset. Boiling them fully softens the starches and makes them safe and tender to eat.
Swap the kidney beans
How well each one fits the dish's main ingredients (clove, tomato, onion, butter, flour):
- Chickpeafits better
- Beansfits better
- Lentilsfits better
- Kidney beansthe original
Fit is the average pairing score against clove, tomato, onion, butter, 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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