Why it works: Celery and onion are a kitchen classic. They rank in the top 7% of all ingredient pairs, and 18,518 recipes mention both. Both carry guaiacol, which smells smoky, sweet. The science ↓
Plain Pease Soup
Ingredients
Directions
Combine split peas, celery, onion, and broth in a pot.
Simmer gently over low heat for 3 hours.
Stir every 15 minutes to prevent sticking and burning.
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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Celery + oniontop 7% of all pairsAroma overlapmoderateMentioned together18,518 recipes
Shared aroma: guaiacol (smoky, sweet).
-
Peas + celerytop 12% of all pairsAroma overlapmoderateMentioned together1,832 recipes
Shared aroma: linalool (floral, citrus).
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Peas + oniontop 13% of all pairsAroma overlapmoderateMentioned together5,460 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
- Split peas
- Break down during long simmering to thicken the soup and give it body.
- Celery
- Adds aromatic flavour that builds the soup's savoury base as it cooks.
- Onion
- Contributes sweetness and aroma as it softens into the broth.
- Broth
- Provides the liquid that cooks the peas and carries the soup's flavour.
The step that matters
Simmer gently and stir every 15 minutes. Split peas contain starch that settles and scorches on the bottom of the pot at high heat. Gentle heat and regular stirring keep the soup from sticking and burning during the long cook.
Flavor stand-ins for the onion
How well each one fits the dish's main ingredients (peas, celery):
- Carrotbetter flavor fit
- Lettucebetter flavor fit
- Leekbetter flavor fit
- Onionthe original
Fit is the average pairing score against peas, celery. 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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