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
Beat the yolks of 2 raw eggs slightly.
Add ¼ teaspoon of coarse sea salt, ¼ teaspoon of mustard, and a pinch of cayenne pepper.
Add olive oil drop by drop, stirring constantly until it thickens.
Thin the mixture with vinegar, alternating with the oil, until ½ pint has been absorbed.
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 + olivetop 8% of all pairsSmell alikestrongCooked together5,950 recipes
Shared aroma: eucalyptol (eucalyptus, herbal).
-
Mustard + peppertop 9% of all pairsSmell alikemoderateCooked together15,430 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Olive + vinegartop 10% of all pairsSmell alikemoderateCooked together12,297 recipes
Shared aroma: isoamyl acetate (banana, fruity).
-
Pepper + olivetop 11% of all pairsSmell alikemoderateCooked together30,263 recipes
Shared aroma: 2,4-decadienal (seaweed).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Egg yolks
- Emulsifiers that bind the oil and water so the dressing thickens smoothly.
- Olive oil
- Supplies the fat that, emulsified into the yolks, builds the thick body of the dressing.
- Vinegar
- Thins the emulsion and adds acidity that balances the richness of the oil.
- Mustard
- Helps stabilise the emulsion and adds a sharp, savoury flavour.
The step that matters
Adding the oil drop by drop. Oil must be dispersed into the yolks in small amounts while stirring constantly. Adding it too fast overwhelms the yolk emulsifiers, so the mixture splits and fails to thicken.
Swap the mustard
How well each one fits the dish's main ingredients (egg, pepper, olive, vinegar):
- Capsicumfits better
- Cucumberfits about as well
- Tomatofits about as well
- Mustardthe original
Fit is the average pairing score against egg, pepper, olive, 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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