Why it works: Lettuce and spinach match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 427 recipes. Both carry 2-isobutyl-3-methoxypyrazine, which smells green bell pepper, earthy. The science ↓
Green-Peas Soup
Ingredients
Directions
Prepare
Shell the peas, separating the old from the young ones.
Make the soup
In a pot, combine old peas, butter, water, lettuce leaves, onions, salt, and pepper. Stew until you can pulp the peas.
Add more water, young peas, lettuce hearts, spinach, and additional salt and pepper. Stew until soft.
Thicken and finish
If the soup is too thin, mix butter with flour and boil for 30 minutes to thicken.
Before serving, boil shredded mint in the soup.
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 their aromas overlap, and how often cooks already put them together.
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Lettuce + spinachtop 1% of all pairsSmell alikestrongCooked together427 recipes
Shared aroma: 2-isobutyl-3-methoxypyrazine (green bell pepper, earthy).
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Peas + minttop 2% of all pairsSmell alikemoderateCooked together1,137 recipes
Shared aroma: 1-octen-3-ol (mushroom, earthy).
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Peas + lettucetop 5% of all pairsSmell alikestrongCooked together1,293 recipes
Shared aroma: 2-isobutyl-3-methoxypyrazine (green bell pepper, earthy).
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Pepper + spinachtop 6% of all pairsSmell alikemoderateCooked together3,400 recipes
Shared aroma: nonanal (fat, citrus).
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Peas + spinachtop 8% of all pairsSmell alikemoderateCooked together550 recipes
Shared aroma: 2-isobutyl-3-methoxypyrazine (green bell pepper, earthy).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Old peas
- Break down into a pulp that gives the soup its body and thickness.
- Young peas
- Add fresh green flavour and a tender texture to the finished soup.
- Butter
- Adds richness and a smooth, rounded mouthfeel to the soup.
- Onions
- Build a savoury, aromatic base as they soften during stewing.
- Lettuce
- Adds gentle sweetness and moisture as it cooks down into the soup.
- Rice or wheat flour
- Starch that thickens the liquid when cooked with butter.
The step that matters
Thickening with butter and flour. Flour must be cooked in fat before it meets liquid so it thickens smoothly without lumps. Boiling it fully lets the starch swell and lose its raw taste.
Swap the mint
How well each one fits the dish's main ingredients (butter, peas, lettuce, onion, pepper, spinach, rice):
- Capersfits better
- Tarragonfits better
- Parsleyfits better
- Mintthe original
Fit is the average pairing score against butter, peas, lettuce, onion, pepper, spinach, rice. Candidates are from the same food group and used in at least 100 recipes.
“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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