Why it works: Mustard and vinegar are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 14,067 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓
Butter Salad Dressing
Ingredients
Directions
In a saucepan, heat the thin cream until it begins to scald.
In a bowl, whisk together the eggs, melted butter, salt, mustard, flour, vinegar, and cayenne.
Slowly add the egg mixture to the scalded cream, stirring constantly.
Cook over low heat until the mixture thickens like soft custard.
Remove from heat and let cool before using.
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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Mustard + vinegartop 7% of all pairsSmell alikemoderateCooked together14,067 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Butter + creamtop 8% of all pairsSmell alikemoderateCooked together41,516 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
-
Mustard + peppertop 9% of all pairsSmell alikemoderateCooked together15,430 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Mustard + flourtop 13% of all pairsSmell alikemoderateCooked together5,066 recipes
Shared aroma: isobutyraldehyde (malty, green).
Butter and flour 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
- Eggs
- Thicken the dressing as they cook, giving it a smooth, custard-like body.
- Thin cream
- Adds richness and moisture, forming the base that the egg mixture thickens.
- Butter
- Adds fat for a rich, smooth mouthfeel and flavor.
- Flour
- Helps stabilize the thickened mixture so it holds together without breaking.
- Vinegar
- Adds acidity that sharpens the flavor and balances the richness of the cream and butter.
The step that matters
Cook over low heat until the mixture thickens like soft custard.. Egg proteins set when heated, but at high heat they can scramble and curdle. Gentle, steady heat while stirring keeps the dressing smooth and thickened.
Swap the mustard
How well each one fits the dish's main ingredients (egg, butter, cream, flour, vinegar, pepper):
- Shallotfits about as well
- Chivefits about as well
- Capsicumfits about as well
- Mustardthe original
Fit is the average pairing score against egg, butter, cream, flour, vinegar, pepper. 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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