Why it works: Onion and potato match in chemistry and in kitchens. They rank in the top 2% of all ingredient pairs, and 9,019 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
Slice the onions, celery, and potatoes.
In a stewpan, combine the sliced vegetables with the butter and water, and simmer for 1 hour.
Add the stock and boil gently until the potatoes are done, about 1 hour.
Rub the mixture through a fine sieve.
Stir in the previously boiled cream and do not let it boil again.
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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Onion + potatotop 2% of all pairsAroma overlapstrongMentioned together9,019 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Butter + creamtop 3% of all pairsAroma overlapstrongMentioned together41,494 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
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Celery + potatotop 4% of all pairsAroma overlapstrongMentioned together2,045 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Onion + celerytop 5% of all pairsAroma overlapmoderateMentioned together18,506 recipes
Shared aroma: guaiacol (smoky, sweet).
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Cream + sugartop 5% of all pairsAroma overlapmoderateMentioned together43,437 recipes
Shared aroma: 2,3-butanedione (butter, sweet).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Potatoes
- Break down when cooked to thicken the soup and give it body.
- Butter
- Adds richness and fat, softening the vegetables gently in the pan.
- Cream
- Adds richness and a smooth, velvety texture to the finished soup.
- Celery
- Contributes savory flavor and aroma as it simmers with the onions.
The step that matters
Stir in the cream without boiling. Once cream is added, boiling can cause it to separate or curdle and turn grainy. Keeping the soup below a boil keeps the texture smooth and creamy.
Flavor stand-ins for the celery
How well each one fits the dish's main ingredients (onion, potato, butter, cream, sugar):
- Garlicbetter flavor fit
- Nutmegabout as good a flavor fit
- Celerythe original
- Cinnamonabout as good a flavor fit
Fit is the average pairing score against onion, potato, butter, cream, sugar. 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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