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 ↓
Boiled Dressing
Ingredients
Directions
Make the dressing
In a bowl, mix together the egg yolks, mustard, salt, cayenne, sugar, melted butter, vinegar, and cream or milk.
Cook the mixture over low heat, stirring constantly, until it thickens like boiled custard.
Finish and serve
If desired, beat the egg whites and fold them in just before serving to increase the quantity.
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).
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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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Sugar + creamtop 9% of all pairsSmell alikemoderateCooked together43,450 recipes
Shared aroma: 2,3-butanedione (butter, sweet).
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Pepper + vinegartop 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
- Egg yolks
- Thicken the dressing as they cook and set into a custard-like texture.
- Butter
- Adds richness and a smooth, rounded mouthfeel to the dressing.
- Vinegar
- Adds acidity that sharpens the flavour and balances the richness.
- Cream or milk
- Adds moisture and softens the dressing for a creamier texture.
- Sugar
- Adds sweetness that balances the vinegar's sharpness.
The step that matters
Cooking the mixture over low heat. Egg yolks thicken through gentle heat; if the heat is too high or stirring stops, the proteins scramble and the dressing turns grainy instead of smooth.
Swap the mustard
How well each one fits the dish's main ingredients (egg, pepper, sugar, butter, vinegar, cream):
- Capsicumfits about as well
- Mustardthe original
- Asparagusfits about as well
- Potatofits about as well
Fit is the average pairing score against egg, pepper, sugar, butter, vinegar, cream. 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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