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
Make the soup
Combine the onions, celery, potatoes, butter, and water in a stewpan.
Simmer for 1 hour.
Add stock to the stewpan.
Boil gently until the potatoes are tender, about 1 hour.
Strain the mixture through a fine sieve.
Finish with cream
Stir in the boiled cream.
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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Celery + peppertop 3% of all pairsAroma overlapstrongMentioned together16,001 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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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).
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 a smooth body.
- Onions
- Add sweetness and savory depth as they soften in the broth.
- Celery
- Adds aromatic, vegetal flavor to the base of the soup.
- Cream
- Adds richness and a silky texture to the finished soup.
- Butter
- Adds fat and richness, helping carry flavor in the soup base.
The step that matters
Do not let it boil again after adding the cream. Cream can curdle or separate when boiled, which would leave the soup grainy. Adding it near the end and keeping the heat gentle protects its smooth texture.
Flavor stand-ins for the celery
How well each one fits the dish's main ingredients (onion, potato, butter, cream, pepper):
- Garlicbetter flavor fit
- Parsleyabout as good a flavor fit
- Celerythe original
- Thymeabout as good a flavor fit
Fit is the average pairing score against onion, potato, butter, cream, 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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