Why it works: Butter and flour are a kitchen classic. They rank in the top 12% of all ingredient pairs, and cooks put them together in 124,287 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓
Kidney Beans with Brown Sauce
Ingredients
Directions
Cook the beans
Place the kidney beans in a saucepan with the soup meat and cover with boiling water.
Boil gently for 30 minutes, then add 1 teaspoon of salt and continue boiling until tender.
Make the sauce
In a frying pan, melt the butter until very brown, then add the flour and brown it again.
Stir in 1 pint of the water used to boil the beans, mixing continuously until it boils and becomes smooth.
Add the finely chopped onion and season with salt and pepper to taste.
Drain the beans and add them to the sauce, then simmer for 10 minutes before serving.
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 + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Kidney beans + oniontop 15% of all pairsSmell alikemoderateCooked together1,050 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Butter + oniontop 15% of all pairsSmell alikemoderateCooked together42,912 recipes
Shared aroma: decanal (soap, orange peel).
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Meat + buttertop 16% of all pairsSmell alikemoderateCooked together7,594 recipes
Shared aroma: guaiacol (smoky, sweet).
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Meat + oniontop 17% of all pairsSmell alikelowCooked together6,364 recipes
Shared aroma: 2,4-decadienal (seaweed).
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
- Become tender and add body and substance to the finished sauce.
- Butter
- Carries the browning that gives the sauce its colour and nutty flavour.
- Flour
- Thickens the liquid into a smooth sauce once stirred into the browned butter.
- Soup meat
- Flavours the bean cooking water that becomes the base of the sauce.
The step that matters
Browning the butter and flour. Cooking the butter and flour together until deeply brown develops colour and roasted flavour, but it can scorch quickly. Stirring constantly keeps the roux even, and the flour must cook long enough to lose its raw taste before liquid is added.
Swap the kidney beans
How well each one fits the dish's main ingredients (meat, butter, onion, flour):
- Almondfits better
- Sesamefits better
- Beansfits better
- Kidney beansthe original
Fit is the average pairing score against meat, butter, onion, 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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