Why it works: Beans and tomato match in chemistry and in kitchens. They rank in the top 2% of all ingredient pairs, and 2,711 recipes mention both. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
The recipe
Ingredients
Contains: milk (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Prepare
Soak the beans in cold water for 24 hours.
Cook
Combine the soaked beans, 8 cups of water, butter, and baking soda in a pot and bring to a boil.
Once boiling, add the tomatoes, celery or parsnip, onions (all chopped into small pieces), and the peeled and sliced beetroot.
Allow to boil for 2½ hours.
Finish and serve
Pass the mixture through a wire sieve.
Season with pepper and salt to taste.
Reheat the soup and serve.
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 aroma chemistry they share, and how many recipes mention both.
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Beans + tomatotop 2% of all pairsAroma overlapstrongMentioned together2,711 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Tomato + celerytop 3% of all pairsAroma overlapstrongMentioned together3,375 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Celery + peppertop 3% of all pairsAroma overlapstrongMentioned together16,001 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Beans + beetroottop 3% of all pairsAroma overlapstrongMentioned together215 recipes
Shared aroma: 2-isobutyl-3-methoxypyrazine (green bell pepper, earthy).
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Tomato + peppertop 4% of all pairsAroma overlapstrongMentioned together17,913 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
- Form the body of the soup and thicken it as they break down during long cooking.
- Tomatoes
- Add acidity and a bright flavour that balances the starchy beans.
- Beetroot
- Contributes earthy sweetness and a deep red colour to the soup.
- Onions
- Build savoury depth as they soften and release their sugars into the broth.
- Butter
- Adds richness and a smooth mouthfeel to the finished soup.
The step that matters
Allow to boil for 2½ hours. Dried haricot beans must cook long enough to become fully soft; undercooked beans stay firm and grainy, and the long simmer also breaks them down so the sieved soup turns smooth.
Flavor stand-ins for the beetroot
How well each one fits the dish's main ingredients (beans, tomato, butter, onion, celery, pepper):
- Capsicumbetter flavor fit
- Carrotbetter flavor fit
- Potatobetter flavor fit
- Beetrootthe original
Fit is the average pairing score against beans, tomato, butter, onion, celery, pepper. Candidates are from the same food group and used in at least 100 recipes. This compares flavor only: it does not check the job the ingredient does in the dish (bulk, moisture, acidity, structure).
“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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