Why it works: Onion and potato are a kitchen classic. They rank in the top 3% of all ingredient pairs, and cooks put them together in 9,023 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Bean-soup with Bread
Ingredients
Directions
Prepare
Soak the beans overnight in water.
Drain and rinse the beans, then place them in a pot with 8 cups of fresh water.
Cook
Add the chopped onion, carrots, and potatoes.
Bring to a boil, then reduce heat and simmer until the beans are tender, about 1-2 hours.
Season with salt to taste and serve with bread.
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 + potatotop 3% of all pairsSmell alikemoderateCooked together9,023 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Carrot + potatotop 4% of all pairsSmell alikestrongCooked together3,107 recipes
Shared aroma: 2-isobutyl-3-methoxypyrazine (green bell pepper, earthy).
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Beans + carrottop 4% of all pairsSmell alikestrongCooked together1,443 recipes
Shared aroma: 2-isobutyl-3-methoxypyrazine (green bell pepper, earthy).
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Beans + potatotop 5% of all pairsSmell alikestrongCooked together655 recipes
Shared aroma: 2-isobutyl-3-methoxypyrazine (green bell pepper, earthy).
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Onion + carrottop 6% of all pairsSmell alikemoderateCooked together21,601 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Dried beans
- Form the body of the soup and thicken it as their starches soften during simmering.
- Potatoes
- Break down slightly during simmering, adding body and making the broth creamier.
- Carrots
- Add sweetness and soften during simmering, rounding out the soup's flavor.
- Onion
- Adds savory aroma and depth as it softens in the broth.
The step that matters
Simmering the beans until tender. Dried beans contain starches and compounds that need prolonged, gentle simmering to soften fully. Stopping early leaves them firm and hard to digest, and a hard boil can break them apart, so keep the heat low and steady.
Swap the onion
How well each one fits the dish's main ingredients (beans, carrot, potato, bread):
- Tomatofits better
- Parsnipfits better
- Asparagusfits better
- Onionthe original
Fit is the average pairing score against beans, carrot, potato, bread. 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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