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
Melt the butter in a saucepan over low heat.
Gradually add the flour, stirring constantly until well combined.
Cook the mixture, stirring continuously, until it loses the raw flour taste.
Slowly stir in the boiling gravy and mix well.
Let it sit for a few minutes, then skim off any fat 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 with fat and adds a rich, savory flavor to the sauce.
- Flour
- Thickens the sauce as it cooks with the butter into a smooth roux.
- Strong pale gravy
- Forms the liquid base of the sauce, carrying the flavor of mushrooms and green onions.
The step that matters
Cook the mixture until it loses the raw flour taste. Cooking the roux long enough cooks out the raw starch flavor, and stirring keeps it smooth and prevents scorching. Adding the gravy to an undercooked roux can leave a pasty taste.
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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