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 and Bacon
Ingredients
Directions
Prepare the beans
Soak the haricot beans overnight in plenty of cold water.
Boil the soaked beans until half cooked, then strain off the water.
Make the soup
Add fresh boiling water to the beans in a smaller quantity.
Insert two cloves into the onion and add it to the pot along with the bacon.
Season with black pepper and coarse sea salt to taste.
Boil until the beans and bacon are fully cooked.
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.
-
Beans + oniontop 7% of all pairsSmell alikestrongCooked together5,242 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
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).
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 thicken it as their starches soften during cooking.
- Bacon
- Adds smoky, savoury fat that flavours the broth as it cooks.
- Onion
- Adds aromatic sweetness and depth to the broth as it cooks.
The step that matters
Boil the soaked beans until half cooked, then strain off the water. Beans can ferment or taste bitter if the cooking water is kept, and the first boil removes compounds that cause digestive discomfort. Starting the second cook with fresh boiling water helps the beans cook evenly and keeps the broth clean.
Swap the onion
How well each one fits the dish's main ingredients (beans, pepper):
- Capsicumfits better
- Spinachfits better
- Tomatofits better
- Onionthe original
Fit is the average pairing score against beans, 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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