Why it works: Peas and cucumber match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and 629 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 pea purée
Boil the green peas tender in three quarts of water with salt and soda.
Drain the peas and pound them in a mortar.
Mix the peas gradually with five pints of the cooking liquor.
Put the mixture over the fire and stew it gently for a quarter of an hour.
Press the mixture through a hair-sieve.
Cook the vegetables
Simmer the cucumbers, lettuce hearts, onions, parsley and mint in three to four ounces of butter over a gentle fire for nearly or quite an hour.
Sprinkle the vegetables with half a teaspoonful of salt and white pepper or cayenne while they cook.
When the vegetables are partially done, drain them from the butter.
Put the drained vegetables into the strained stock.
Boil the soup gently until all the butter has risen to the surface and been cleared off.
Finish and serve
Add half to three quarters of a pint of young peas boiled as for eating.
Serve the soup immediately.
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. See the original page.
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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 + cucumbertop 3% of all pairsAroma overlapstrongMentioned together629 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Cucumber + lettucetop 2% of all pairsAroma overlapstrongMentioned together1,409 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Peas + lettucetop 3% of all pairsAroma overlapstrongMentioned together1,293 recipes
Shared aroma: 2-isobutyl-3-methoxypyrazine (green bell pepper, earthy).
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Cucumber + oniontop 6% of all pairsAroma overlapstrongMentioned together6,049 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Lettuce + oniontop 6% of all pairsAroma overlapstrongMentioned together3,562 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
- Green peas
- Form the body and thick, smooth texture of the soup once pounded and strained.
- Butter
- Carries flavor and gives richness while the vegetables cook gently, then is skimmed off.
- Lettuce hearts
- Soften during gentle simmering and add delicate, sweet, vegetal flavor to the soup.
- Cucumbers
- Soften in butter and add a mild, fresh flavor to the finished soup.
- Onions
- Soften in butter and add savory depth to the soup base.
The step that matters
Skimming the butter off the soup. Butter that is not fully risen and cleared off leaves the soup greasy. Gentle boiling lets the fat separate to the surface so it can be removed.
Flavor stand-ins for the onion
How well each one fits the dish's main ingredients (butter, peas, cucumber, lettuce):
- Cauliflowerbetter flavor fit
- Asparagusbetter flavor fit
- Beetrootbetter flavor fit
- Onionthe original
Fit is the average pairing score against butter, peas, cucumber, lettuce. 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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