Why it works: Vinegar and mustard 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 ↓
Boiled Dressing
Ingredients
Directions
Beat the eggs with the mustard in a bowl.
In a double boiler, combine the eggs, mustard, vinegar, salt, cayenne, sugar, and cream.
Heat the vinegar to boiling point in a separate pan and add the butter to melt.
Pour the melted butter and vinegar into the double boiler mixture.
Cook while stirring constantly until the mixture reaches the consistency of soft custard.
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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Vinegar + mustardtop 7% of all pairsSmell alikemoderateCooked together14,067 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Cream + buttertop 8% of all pairsSmell alikemoderateCooked together41,516 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
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Pepper + mustardtop 9% of all pairsSmell alikemoderateCooked together15,430 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Sugar + creamtop 9% of all pairsSmell alikemoderateCooked together43,450 recipes
Shared aroma: 2,3-butanedione (butter, sweet).
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Vinegar + peppertop 14% of all pairsSmell alikemoderateCooked together27,814 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Eggs
- Coagulate when gently heated, thickening the dressing into a custard-like texture.
- Cream
- Adds richness and moisture, softening the sharpness of the vinegar.
- Butter
- Adds fat for a smooth, rounded mouthfeel in the finished dressing.
- Vinegar
- Provides acidity that gives the dressing its tangy flavour.
- Mustard
- Adds sharp flavour and helps emulsify the eggs and fat.
The step that matters
Cook while stirring constantly. Egg proteins set gently with heat, so the mixture can curdle if it overheats or stops being stirred. Slow, constant stirring over a double boiler keeps it smooth and thickens it evenly into soft custard.
Swap the mustard
How well each one fits the dish's main ingredients (vinegar, egg, pepper, sugar, cream, butter):
- Capsicumfits about as well
- Mustardthe original
- Asparagusfits about as well
- Potatofits about as well
Fit is the average pairing score against vinegar, egg, pepper, sugar, cream, butter. 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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