Why it works: Butter and bread are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 27,232 recipes. Both carry delta-decalactone, which smells sweet, creamy. The science ↓
String-bean Soup
Ingredients
Directions
Prepare the beans
Boil string beans in hot salted water until very tender.
Drain and chop the beans, then rub them through a colander to a pulp.
Make the soup
Pour the fat from the stock into a soup pot and bring to a boil.
Skim the fat and stir in the bean pulp with butter and flour.
Simmer for 15 minutes, add seasoning if necessary, and serve over diced 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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Butter + breadtop 7% of all pairsSmell alikemoderateCooked together27,232 recipes
Shared aroma: delta-decalactone (sweet, creamy).
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Beans + flourtop 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).
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Beans + breadtop 15% of all pairsSmell alikemoderateCooked together332 recipes
Shared aroma: guaiacol (smoky, sweet).
-
Beans + buttertop 19% of all pairsSmell alikemoderateCooked together2,799 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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
- String beans
- Provide the main body and flavor, becoming a thick pulp that gives the soup its texture.
- Flour
- Thickens the soup by binding with the fat and bean pulp as it simmers.
- Butter
- Adds richness and a rounder flavor to the soup.
- Fat from stock
- Carries flavor and adds richness to the base of the soup.
The step that matters
Skim the fat and stir in the bean pulp with butter and flour. Flour must be fully incorporated into the hot fat before or as the pulp is added, otherwise it clumps and leaves raw floury lumps. Adding it to a simmering liquid while stirring keeps the thickening even.
Swap the beans
How well each one fits the dish's main ingredients (butter, flour, bread):
- Almondfits better
- Chestnutfits better
- Lentilsfits about as well
- Beansthe original
Fit is the average pairing score against butter, flour, 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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