Why it works: Onion and beans match in chemistry and in kitchens. They rank in the top 7% of all ingredient pairs, and cooks put them together in 5,242 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Brittany Beans
Ingredients
Directions
Prepare the onions
Scald and drain the sliced onions.
Make the sauce
Fry the onions in butter until pale brown.
Sprinkle flour, pepper, and salt over the onions and toss for 5 minutes.
Add stock and stew for about 20 minutes, stirring frequently.
Finish and serve
Add well-cooked haricot beans and toss with additional butter 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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Onion + beanstop 7% of all pairsSmell alikestrongCooked together5,242 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Pepper + beanstop 11% of all pairsSmell alikemoderateCooked together4,733 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Onion + peppertop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Flour + beanstop 11% of all pairsSmell alikemoderateCooked together2,080 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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
- Onions
- Soften and sweeten as they fry, forming the base of the dish.
- Butter
- Adds richness and fat, helping the onions brown and coating the beans.
- Flour
- Thickens the stock into a sauce as it cooks with the onions.
- Stock
- Liquid that cooks the onions and forms the body of the sauce.
- Haricot beans
- Provide the main bulk and soft, starchy texture of the dish.
The step that matters
Stirring while the stock stews. Flour mixed with onions can clump when liquid is added. Frequent stirring keeps the flour dispersed so the sauce thickens smoothly rather than becoming lumpy.
Swap the onion
How well each one fits the dish's main ingredients (butter, flour, pepper, beans):
- Okrafits better
- Sweet potatofits better
- Chivefits better
- Onionthe original
Fit is the average pairing score against butter, flour, pepper, beans. 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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