Why it works: Peas and potato are a kitchen classic. They rank in the top 9% of all ingredient pairs, and 1,016 recipes mention both. Both carry 2-isobutyl-3-methoxypyrazine, which smells green bell pepper, earthy. The science ↓
Green Pea Soup
Ingredients
Directions
Make the soup base
Wash the lamb in cold water and place it in a soup pot with 6 quarts of cold water.
Add 2 tablespoons of coarse sea salt and bring to a gentle boil over moderate heat for 2 hours, skimming as needed.
Add the vegetables
Add 1 quart of shelled peas and 1 teaspoon of pepper, cover, and boil for 30 minutes.
Scrape the skins from 1 quart of small young potatoes and add them to the soup.
Cover the pot and boil for an additional 30 minutes.
Finish
Work ¼ pound of butter and 2 teaspoons of flour together, then add to the soup 10‑12 minutes before serving.
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.
Photo for illustrative purposes only · Contact us to use it
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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Peas + potatotop 9% of all pairsAroma overlapmoderateMentioned together1,016 recipes
Shared aroma: 2-isobutyl-3-methoxypyrazine (green bell pepper, earthy).
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Pepper + potatotop 9% of all pairsAroma overlapmoderateMentioned together8,305 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Lamb + potatotop 9% of all pairsAroma overlapmoderateMentioned together520 recipes
Shared aroma: 2-undecenal (sweet).
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Lamb + peppertop 12% of all pairsAroma overlapmoderateMentioned together3,165 recipes
Shared aroma: 2-nonenal (fatty, green).
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Butter + flourtop 12% of all pairsAroma overlaplowMentioned together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
Butter and flour share little aroma chemistry, yet 124,287 recipes mention both: they likely work on texture and structure more than aroma.
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Lamb
- Provides the meat and rich, savoury flavour that gives the broth its body.
- Shelled peas
- Supply the sweet, green flavour and soft texture that define the soup.
- Potatoes
- Break down slightly as they cook, adding body and thickening the soup.
- Butter
- Adds fat and richness, rounding out the flavour and mouthfeel of the broth.
- Flour
- Worked with butter into a paste that thickens the soup when stirred in.
The step that matters
Adding the butter and flour mixture. Added directly, the flour can clump and stay raw-tasting. Working it with butter into a smooth paste and stirring it into simmering soup lets it disperse and thicken evenly.
Flavor stand-ins for the potato
How well each one fits the dish's main ingredients (lamb, peas, pepper, butter, flour):
- Asparagusabout as good a flavor fit
- Shallotabout as good a flavor fit
- Spinachabout as good a flavor fit
- Potatothe original
Fit is the average pairing score against lamb, peas, pepper, butter, flour. 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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