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 ↓
Salad Dressing
Ingredients
Directions
Make the dressing
In a bowl, mash the yolks of the hard-boiled eggs until smooth.
Mix in the melted butter, salt, dry mustard, sugar, and pepper.
Gradually stir in the milk or cream and enough vinegar to thicken the mixture.
Boil the mixture while stirring briskly until smooth, even if it curdles.
If not using cream, dissolve corn-starch in the milk to help thicken.
Serve
Use the egg whites to garnish the salad.
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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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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Milk + corntop 10% of all pairsSmell alikemoderateCooked together6,955 recipes
Shared aroma: hexanal (green, grassy).
-
Pepper + corntop 11% of all pairsSmell alikemoderateCooked together5,324 recipes
Shared aroma: 2-nonenal (fatty, green).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Hard-boiled egg yolks
- Mashed yolks add richness and body, and their proteins help bind the dressing as it heats.
- Melted butter
- Adds fat for a smooth, rich mouthfeel and a softer texture.
- Milk or cream
- Forms the liquid base that gives the dressing its pourable body.
- Corn-starch
- Thickens the liquid when heated, helping the dressing set to a creamy consistency.
- Vinegar
- Adds acidity that brightens the flavour and cuts the richness of the eggs and butter.
- Dry mustard
- Adds a sharp, aromatic bite that balances the sweetness and richness.
The step that matters
Boil the mixture while stirring briskly. Egg proteins can scramble and curdle when overheated, so constant stirring keeps heat even and the dressing smooth. Starch needs to reach a boil to thicken fully.
Swap the mustard
How well each one fits the dish's main ingredients (egg, butter, sugar, pepper, milk, vinegar, corn):
- Capsicumfits better
- Potatofits better
- Asparagusfits about as well
- Mustardthe original
Fit is the average pairing score against egg, butter, sugar, pepper, milk, vinegar, corn. 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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