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 salt, pepper, and dry mustard.
Add a little oil and beat well for a few minutes.
Break the eggs into the bowl and beat them in.
Continue adding oil gradually until the mixture thickens.
Add vinegar drop by drop to taste while stirring continuously.
The mayonnaise should be smooth and creamy.
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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Pepper + mustardtop 9% of all pairsSmell alikemoderateCooked together15,430 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Pepper + vinegartop 14% of all pairsSmell alikemoderateCooked together27,814 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
-
Mustard + eggtop 28% of all pairsSmell alikemoderateCooked together9,210 recipes
Shared aroma: (e)-2-octenal (fatty, green).
-
Egg + vinegartop 33% of all pairsSmell alikelowCooked together12,922 recipes
Shared aroma: acetic acid (sour, vinegar).
Egg and vinegar barely smell alike, yet cooks put them together in 12,922 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
- Their proteins emulsify the oil and water into a stable, thick, creamy mixture.
- Oil
- Forms the bulk of the emulsion, providing richness and body to the dressing.
- Dry mustard
- Helps stabilise the emulsion so the oil and egg mixture stays combined.
- Vinegar
- Adds acidity that brightens the flavour and balances the richness of the oil.
The step that matters
Adding the oil gradually. Oil added too fast before the egg emulsion has formed can separate and fail to thicken. Adding it slowly lets each droplet be dispersed and coated by the egg proteins, producing a smooth, stable emulsion.
Swap the mustard
How well each one fits the dish's main ingredients (pepper, egg, vinegar):
- Capsicumfits better
- Mustardthe original
- Cucumberfits about as well
- Cabbagefits less well
Fit is the average pairing score against pepper, egg, vinegar. 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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