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 sauce
Fry the flour, butter, and tomatoes in a pan until they turn a good brown color.
Add the stock and stir until it boils.
Let it boil until reduced by one fourth, skimming off any fat.
Once free from fat, strain the sauce through a fine sieve.
Keep ready
This sauce can be kept ready for use by boiling it up once or twice a week.
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.
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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).
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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 fat, giving it body and structure.
- Butter
- Provides fat for frying the flour, adding richness and a toasted, nutty flavour.
- Tomatoes
- Add acidity and savoury flavour, and their sugars contribute to the browning.
- Stock
- Forms the liquid base of the sauce, supplying most of its meaty flavour.
The step that matters
Frying the flour, butter and tomatoes to a good brown. Browning builds colour and toasted flavour, but once the flour scorches it turns bitter and acrid. Stop at a good brown, because scorched flour cannot be rescued and spoils the whole sauce.
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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