Why it works: Butter and mushroom are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 12,525 recipes. Both carry trans-2-decenal, which smells waxy, orange. The science ↓
Sauce Tournee, or Pale Thickened Gravy
Ingredients
Directions
Make the roux
Melt the butter in a saucepan over low heat.
Gradually whisk in the flour until smooth.
Cook the mixture, stirring constantly, until it simmers and loses the raw flour taste.
Finish the gravy
Slowly add the boiling gravy while stirring continuously.
Add chopped mushrooms and green onions, and simmer for 30 minutes.
Strain the sauce before serving.
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 + mushroomtop 7% of all pairsSmell alikemoderateCooked together12,525 recipes
Shared aroma: trans-2-decenal (waxy, orange).
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Mushroom + oniontop 10% of all pairsSmell alikemoderateCooked together10,626 recipes
Shared aroma: 2,4-decadienal (seaweed).
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Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Butter + oniontop 15% of all pairsSmell alikemoderateCooked together42,912 recipes
Shared aroma: decanal (soap, orange peel).
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Flour + oniontop 17% of all pairsSmell alikemoderateCooked together32,460 recipes
Shared aroma: isobutyraldehyde (malty, green).
Butter and flour 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
- Butter
- Enriches the roux and gives the sauce a rich, smooth flavour.
- Flour
- Thickens the gravy as it cooks with the butter and liquid.
- Strong pale gravy
- Provides the main liquid and savoury base of the sauce.
- Mushrooms
- Add earthy flavour and body to the finished sauce.
The step that matters
Cooking the roux until it loses the raw flour taste. Flour that is not cooked enough tastes pasty and raw. Stirring constantly over gentle heat cooks the starch evenly and prevents scorching or lumps, which keeps the sauce smooth and pale.
Swap the onion
How well each one fits the dish's main ingredients (butter, flour, mushroom):
- Shallotfits better
- Chivefits better
- Leekfits better
- Onionthe original
Fit is the average pairing score against butter, flour, 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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