Why it works: Flour and butter are a kitchen classic. They rank in the top 12% of all ingredient pairs, and 124,287 recipes mention both. Both carry isobutyraldehyde, which smells malty, green. The science ↓
Brown Sauce
Ingredients
Directions
Make the roux
Melt butter in a pan, then add flour and tomatoes.
Fry until the mixture turns a good brown color.
Make the sauce
Add stock and stir until it boils.
Boil until reduced by one fourth, skimming off fat.
Strain sauce through a tammy (fine sieve) once free of fat.
Store
Store sauce and reheat once or twice a week for use.
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.
Photo for illustrative purposes only · Contact us to use it
Explore the science
The flavor team
The pairs that carry this dish. Each one is judged two ways: how much aroma chemistry they share, and how many recipes mention both.
-
Flour + buttertop 12% of all pairsAroma overlaplowMentioned together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Butter + meattop 16% of all pairsAroma overlapmoderateMentioned together7,594 recipes
Shared aroma: guaiacol (smoky, sweet).
-
Tomato + meattop 17% of all pairsAroma overlaplowMentioned together1,438 recipes
Shared aroma: 1-octen-3-one (mushroom, metallic).
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Butter + tomatotop 22% of all pairsAroma overlapmoderateMentioned together6,918 recipes
Shared aroma: 3-hexenal (apple, fruity).
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Flour + tomatotop 22% of all pairsAroma overlapmoderateMentioned together7,065 recipes
Shared aroma: isobutyraldehyde (malty, green).
Flour and butter share little aroma chemistry, yet 124,287 recipes mention both: they likely 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.
- Butter
- Carries the flour and adds richness while the mixture browns.
- Tomatoes
- Add acidity and color to the sauce.
- Stock
- Forms the liquid base that gives the sauce its body and savory flavor.
The step that matters
Fry until the mixture turns a good brown color. Browning the flour and butter builds nutty, roasted flavor and color. Cooking too briefly leaves a pale, raw-tasting sauce, while going too far scorches it and gives a bitter taste.
Flavor stand-ins for the tomato
How well each one fits the dish's main ingredients (flour, butter, meat):
- Shallotbetter flavor fit
- Leekbetter flavor fit
- Potatobetter flavor fit
- Tomatothe original
Fit is the average pairing score against flour, butter, meat. Candidates are from the same food group and used in at least 100 recipes. This compares flavor only: it does not check the job the ingredient does in the dish (bulk, moisture, acidity, structure).
“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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