Why it works: Pepper and parsley match in chemistry and in kitchens. They rank in the top 2% of all ingredient pairs, and cooks put them together in 34,122 recipes. Both carry 4'-methylacetophenone, which smells bitter almond. The science ↓
Barley Soup
Ingredients
Directions
In a large pot, combine 4 quarts of water and 2 pounds of meat trimmings.
Add ¼ pound of pearl barley, 4 sliced onions, salt, and pepper.
If available, add a little parsley.
Simmer for at least 3 hours, or until the meat is tender.
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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Pepper + parsleytop 2% of all pairsSmell alikestrongCooked together34,122 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Onion + parsleytop 9% of all pairsSmell alikemoderateCooked together25,843 recipes
Shared aroma: 2,4-decadienal (seaweed).
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Barley + parsleytop 10% of all pairsSmell alikestrongCooked together630 recipes
Shared aroma: 2,4-decadienal (seaweed).
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Barley + oniontop 10% of all pairsSmell alikemoderateCooked together1,166 recipes
Shared aroma: 2,4-decadienal (seaweed).
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Onion + peppertop 11% of all pairsSmell alikemoderateCooked together68,474 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
- Pearl barley
- Thickens the broth and adds a chewy, hearty texture as it softens.
- Meat trimmings
- Release flavor and gelatin into the broth during long simmering.
- Onions
- Add sweetness and aromatic depth to the broth as they cook down.
The step that matters
Simmer for at least 3 hours. Low, steady simmering slowly breaks down connective tissue in the meat and softens the barley, producing tender meat and a well-developed broth. Cooking too fast or too briefly leaves the meat tough and the barley firm.
Swap the parsley
The recipe marks parsley as optional. How well each one fits the dish's main ingredients (meat, barley, onion, pepper):
- Thymefits better
- Celeryfits about as well
- Garlicfits about as well
- Parsleythe original
Fit is the average pairing score against meat, barley, onion, pepper. 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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