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 ↓
Boiled Dressing
Ingredients
Directions
In the upper part of a double boiler, mix the dry ingredients.
Add the well-beaten egg yolks and milk.
Slowly add the vinegar; cook over boiling water, stirring constantly until thick.
Remove from heat, add butter, strain, and cool.
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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Butter + milktop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Mustard + vinegartop 7% of all pairsSmell alikemoderateCooked together14,067 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Mustard + peppertop 9% of all pairsSmell alikemoderateCooked together15,430 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Flour + buttertop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Mustard + flourtop 13% of all pairsSmell alikemoderateCooked together5,066 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
- Egg yolks
- Coagulate as they heat, thickening the dressing and giving it body.
- Flour
- Its starch swells with heat, helping thicken the dressing.
- Butter
- Adds richness and a smooth mouthfeel to the finished dressing.
- Milk
- Provides the liquid base and adds creaminess.
- Vinegar
- Adds sharp acidity that balances the richness.
- Sugar
- Adds mild sweetness to balance the sharp vinegar.
The step that matters
Cook while stirring constantly until thick. Egg yolks can scramble if they overheat or sit still. Constant stirring over gentle heat keeps the dressing smooth while the yolks and flour thicken it.
Swap the mustard
How well each one fits the dish's main ingredients (pepper, sugar, flour, egg, butter, milk, vinegar):
- Capsicumfits better
- Shallotfits about as well
- Mustardthe original
- Chivefits about as well
Fit is the average pairing score against pepper, sugar, flour, egg, butter, milk, vinegar. 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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