Why it works: Butter and milk are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 81,283 recipes. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓
Thin White Sauce
Ingredients
Directions
Make the roux
Melt the butter in a saucepan.
Add the flour and salt, and cook thoroughly.
Add the milk and thicken
Slowly add the milk while stirring constantly.
Continue stirring and cooking until the sauce thickens.
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 their aromas overlap, and how often cooks already put them together.
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Butter + milktop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Flour + buttertop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + milktop 14% of all pairsSmell alikelowCooked together78,219 recipes
Shared aroma: isobutyraldehyde (malty, green).
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
- Its starch thickens the milk into a smooth sauce as it cooks.
- Butter
- Its fat coats the flour to make a roux and adds richness.
- Milk
- Forms the liquid body of the sauce, which thickens as the starch swells.
The step that matters
Adding the milk slowly while stirring. Flour starch must be evenly dispersed in the fat before and during liquid addition. Adding milk gradually and stirring constantly prevents lumps, because the starch granules hydrate evenly rather than clumping. Continued cooking then swells the starch and thickens the sauce.
“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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