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 ↓
Dry White Beans, Breton Ne
Ingredients
Directions
Prepare the beans
Cook the beans as directed in a previous recipe.
Drain the beans in a colander.
Cook the onions and sauce
In a saucepan, fry the onions in butter until light brown.
Add the vinegar and reduce the mixture by one-third.
Stir in a few spoonfuls of Espagnole sauce and the cooked beans.
Season with salt and pepper.
Cover and let simmer for 30 minutes.
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).
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Beans + peppertop 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).
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Onion + vinegartop 14% of all pairsSmell alikemoderateCooked together18,226 recipes
Shared aroma: acetic acid (sour, vinegar).
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Vinegar + peppertop 14% of all pairsSmell alikemoderateCooked together27,814 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Dry white beans
- Form the main body of the dish, softening into a tender, creamy texture when cooked.
- Onions
- Browning in butter builds sweetness and savory depth that flavors the whole dish.
- Butter
- Fat that carries flavor and helps the onions brown richly.
- Vinegar
- Adds acidity that brightens the rich sauce and balances its sweetness.
- Espagnole sauce
- Contributes body and concentrated savory flavor to the beans.
The step that matters
Reduce the mixture by one-third. Reducing concentrates the vinegar and onion flavors and thickens the liquid. Reducing too little leaves the dish thin and sharp, while reducing too far can make it overly salty or sticky once the sauce and beans are added.
Swap the beans
How well each one fits the dish's main ingredients (onion, butter, vinegar, sauce, pepper):
- Sesamefits better
- Black-eyed peafits about as well
- Beansthe original
- Soybeanfits about as well
Fit is the average pairing score against onion, butter, vinegar, sauce, pepper. 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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