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 base
Combine broth, milk, onion, and mace in a stew-pan.
Bring the mixture to a boil and simmer for 10 minutes.
Rub flour and butter together on a plate until well mixed.
Add the flour and butter mixture to the stew-pan, stirring until it boils.
Reduce the heat.
Stir the sauce occasionally until it becomes smooth.
Strain the sauce through a sieve into a basin.
Return the strained sauce to the stew-pan.
Finish and enrich
Season the sauce with coarse sea salt and lemon juice.
Beat the egg yolks with 3 tablespoons of milk in a bowl.
Strain the beaten yolk mixture into the sauce.
Stir the sauce well and keep it warm, ensuring it does not boil.
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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Flour + buttertop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Milk + flourtop 14% of all pairsSmell alikelowCooked together78,219 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Onion + buttertop 15% of all pairsSmell alikemoderateCooked together42,912 recipes
Shared aroma: decanal (soap, orange peel).
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Milk + lemontop 15% of all pairsSmell alikemoderateCooked together19,053 recipes
Shared aroma: 2-nonenal (fatty, 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 sauce as it cooks.
- Butter
- Adds richness and carries flour so it blends without lumps.
- Egg yolks
- Enrich and thicken the sauce gently when added off the boil.
- Milk
- Forms the creamy liquid base that gives the sauce body and mild sweetness.
- Broth
- Provides savoury depth to the sauce base.
The step that matters
Keep the sauce below boiling after adding the egg yolks. Egg proteins set and can curdle or scramble when overheated, so the sauce must stay warm but not boil once the yolks are stirred in.
Swap the mace
How well each one fits the dish's main ingredients (milk, onion, flour, butter, lemon, egg):
- Parsleyfits better
- Capersfits better
- Nutmegfits better
- Macethe original
Fit is the average pairing score against 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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