Why it works: Beans and onion 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 ↓
Haricot Bean Soup
Ingredients
Directions
Prepare
Soak the beans overnight in cold water with the pinch of bicarbonate of soda.
Cook the soup
Melt the dripping in a saucepan, then add the minced onion and drained beans.
Cook for five minutes with the lid on the saucepan.
Add 1½ pints of water and simmer for three to four hours, or until the beans are tender.
Finish and serve
Pass the mixture through a fine sieve, add the milk, and reheat gently, seasoning with salt and pepper.
Serve with croutons of fried 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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Beans + oniontop 7% of all pairsSmell alikestrongCooked together5,242 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Milk + breadtop 11% of all pairsSmell alikemoderateCooked together11,466 recipes
Shared aroma: 2-undecenal (sweet).
-
Beans + peppertop 11% of all pairsSmell alikemoderateCooked together4,733 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Onion + peppertop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Beans + breadtop 15% of all pairsSmell alikemoderateCooked together332 recipes
Shared aroma: guaiacol (smoky, sweet).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Haricot beans
- Provide the bulk of the soup and, once softened and sieved, its thick body.
- Bicarbonate of soda
- Softens the bean skins during soaking so the beans cook tender.
- Dripping
- Carries the flavour of the onion and adds richness through fat.
- Milk
- Adds creaminess and mellows the soup's flavour when stirred in.
The step that matters
Simmering until the beans are tender. Haricot beans must be fully softened before sieving, because undercooked skins and starch stay grainy and the soup will not thicken smoothly. Soaking helps, but the long simmer does the real work.
Swap the onion
How well each one fits the dish's main ingredients (beans, milk, pepper, bread):
- Tomatofits better
- Capsicumfits better
- Asparagusfits better
- Onionthe original
Fit is the average pairing score against beans, milk, pepper, 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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