Why it works: Milk and butter 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 ↓
White Sauce
Ingredients
Directions
Make the sauce
Combine mushroom broth, milk, onion pieces, and mace in a saucepan and boil for 10 minutes.
Mix flour and butter together, then stir into the boiling mixture until it thickens.
Remove from heat and strain through a fine sieve back into the pan.
Finish the sauce
Add a little salt and lemon juice.
Beat the egg yolks and mix with the cream, then strain into the sauce.
Stir over low heat, ensuring it does not boil to prevent curdling.
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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Milk + buttertop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Mushroom + buttertop 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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Mushroom + milktop 12% of all pairsSmell alikemoderateCooked together2,231 recipes
Shared aroma: 1-hexanal (fruit).
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Flour + buttertop 12% of all pairsSmell alikelowCooked together124,287 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
- Thickens the liquid into a smooth, coating sauce as it cooks.
- Butter
- Carries flavour and enriches the sauce, helping it feel smooth on the palate.
- Egg yolks
- Add richness and further thicken the sauce when gently heated.
- Cream
- Adds fat and richness, giving the sauce a softer, silkier texture.
- Mushroom broth
- Forms the savoury liquid base that the sauce is built on.
The step that matters
Stir over low heat without boiling after adding the egg yolks. Egg yolk proteins set when overheated, so the sauce can curdle or turn grainy if it boils. Gentle heat keeps it smooth and thick.
Swap the mace
How well each one fits the dish's main ingredients (mushroom, milk, onion, flour, butter, lemon, egg):
- Thymefits better
- Parsleyfits better
- Nutmegfits better
- Macethe original
Fit is the average pairing score against mushroom, milk, onion, flour, butter, lemon, egg. 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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