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 ↓
Mayonnaise Dressing
Ingredients
Directions
In a bowl, combine dry mustard, salt, and vinegar.
Beat in the yolks of 2 raw eggs.
Slowly add butter or oil, a few drops at a time, while beating continuously.
Fold in the beaten egg whites.
Add vinegar or lemon juice, continuing to beat until thickened.
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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Mustard + peppertop 9% of all pairsSmell alikemoderateCooked together15,430 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Vinegar + peppertop 14% of all pairsSmell alikemoderateCooked together27,814 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
-
Egg + buttertop 17% of all pairsSmell alikemoderateCooked together118,967 recipes
Shared aroma: decanal (soap, orange peel).
-
Butter + peppertop 21% of all pairsSmell alikemoderateCooked together85,593 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Egg yolks
- Emulsify the oil and vinegar, binding them into a thick, smooth dressing.
- Butter or oil
- Provides the fat that, dispersed into droplets, gives the dressing its richness and body.
- Egg whites
- Add volume and lightness to the dressing once folded in.
- Vinegar or lemon juice
- Adds acidity that balances the richness and helps thicken the emulsion.
- Dry mustard
- Helps stabilise the emulsion and adds a sharp, pungent flavour.
The step that matters
Slowly add butter or oil, a few drops at a time. Adding fat too quickly overwhelms the egg yolk's ability to hold it in droplets, so the emulsion breaks and the dressing separates into a greasy liquid. Beating continuously keeps the droplets small and the mixture thick.
Swap the mustard
How well each one fits the dish's main ingredients (vinegar, egg, butter, pepper):
- Capsicumfits better
- Mustardthe original
- Shallotfits about as well
- Cucumberfits about as well
Fit is the average pairing score against vinegar, egg, butter, 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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