Why it works: Butter and bread are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 27,232 recipes. Both carry delta-decalactone, which smells sweet, creamy. The science ↓
Barley Soup
Ingredients
Directions
Make the soup base
Boil the stock and milk together in a saucepan.
Melt the butter in a separate pan, then stir in the flour.
Add the stock and milk mixture to the butter and flour, stirring until it boils.
Cook and serve
Sprinkle in the barley, stir, and cook until the mixture becomes transparent, about 10 minutes.
Season with salt and pepper to taste, and serve with croutons on the side.
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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Butter + breadtop 7% of all pairsSmell alikemoderateCooked together27,232 recipes
Shared aroma: delta-decalactone (sweet, creamy).
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Milk + buttertop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Milk + breadtop 11% of all pairsSmell alikemoderateCooked together11,466 recipes
Shared aroma: 2-undecenal (sweet).
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Flour + buttertop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Bread + barleytop 12% of all pairsSmell alikemoderateCooked together201 recipes
Shared aroma: 2-nonenal (fatty, green).
Flour and butter barely smell alike, yet cooks put them together in 124,287 recipes: they 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
- Barley
- Thickens the soup and adds a chewy texture as it cooks.
- Butter and flour
- Form a roux that helps thicken the milk and stock base.
- Milk
- Adds richness and a creamy body to the soup.
The step that matters
Stirring the stock into the roux. Adding liquid to a hot roux while stirring keeps the flour smooth and prevents lumps. Bringing the mixture to a boil then fully hydrates the starch so the soup thickens evenly.
“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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