Why it works: Flour and butter are a kitchen classic. They rank in the top 12% of all ingredient pairs, and cooks put them together in 124,287 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓
Brown or Spanish Sauce
Ingredients
Directions
In a saucepan, melt the butter over medium heat.
Add the flour and cook together, stirring constantly until it turns brown.
Once browned, gradually add the stock while stirring continuously.
For a richer color, add a few drops of caramel or burnt sugar, or 1 teaspoon of kitchen bouquet.
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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Flour + buttertop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + sugartop 15% of all pairsSmell alikemoderateCooked together92,116 recipes
Shared aroma: phenylacetaldehyde (hawthorne, honey).
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Butter + sugartop 17% of all pairsSmell alikemoderateCooked together98,233 recipes
Shared aroma: guaiacol (smoky, sweet).
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
- Flour
- Thickens the sauce as it cooks with the butter and stock, giving it body.
- Butter
- Melts to form the fat base in which the flour is cooked and browned.
- Consomme or brown soup stock
- Liquid that hydrates the cooked flour, turning the roux into a smooth sauce.
The step that matters
Cooking the flour until brown. Flour must be stirred constantly while it browns so it colors evenly without scorching. Scorched flour gives a bitter taste, and the stock should be added only once the roux has reached the intended color.
“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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