Why it works: Thyme and mushroom are a kitchen classic. They rank in the top 5% of all ingredient pairs, and cooks put them together in 2,557 recipes. Both carry 1-octen-3-one, which smells mushroom, metallic. The science ↓
Italian Sauce
Ingredients
Directions
Melt the butter in a pan over medium heat.
Add the onion, peppercorns, bay leaf, and thyme; fry until pale brown.
Stir in the flour and brown it as well.
Add the mushrooms, stock, and sherry; stir until boiling.
Boil gently for about 15 minutes, season with salt, and strain.
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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Thyme + mushroomtop 5% of all pairsSmell alikemoderateCooked together2,557 recipes
Shared aroma: 1-octen-3-one (mushroom, metallic).
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Sherry + mushroomtop 5% of all pairsSmell alikemoderateCooked together1,176 recipes
Shared aroma: 2-methoxy-4-methylphenol (smoky, clove).
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Thyme + oniontop 7% of all pairsSmell alikemoderateCooked together11,171 recipes
Shared aroma: coumarin (sweet, hay).
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Butter + mushroomtop 7% of all pairsSmell alikemoderateCooked together12,525 recipes
Shared aroma: trans-2-decenal (waxy, orange).
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Onion + mushroomtop 10% of all pairsSmell alikemoderateCooked together10,626 recipes
Shared aroma: 2,4-decadienal (seaweed).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Flour
- Thickens the sauce and, when browned, adds a nutty flavor and color.
- Butter
- Carries the aromatics and forms the fat base for the roux.
- Onion
- Builds savory depth as it browns in the fat.
- Mushrooms
- Add earthy umami flavor that deepens the sauce as it simmers.
- Sherry
- Adds acidity and sweetness that brighten and round the sauce.
- Stock
- Forms the liquid base that the flour thickens and the flavors simmer into.
The step that matters
Browning the flour. Flour must be cooked until it turns color to remove raw starch taste and build nutty flavor. Stirring constantly prevents scorching, since burnt flour turns bitter and dark sauce tastes harsh.
Swap the onion
How well each one fits the dish's main ingredients (butter, flour, thyme, sherry, mushroom):
- Shallotfits better
- Leekfits better
- Chivefits better
- Onionthe original
Fit is the average pairing score against butter, flour, thyme, sherry, mushroom. 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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