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
Combine mustard, salt, cayenne, and egg yolk in a bowl.
Gradually add olive oil while stirring steadily in one direction until a thick paste forms.
To thin the mayonnaise, add vinegar or lemon juice and sweet cream until it reaches a very thick cream consistency.
If the mixture becomes too thin, add another egg yolk to restore thickness.
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).
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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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Olive + vinegartop 10% of all pairsSmell alikemoderateCooked together12,297 recipes
Shared aroma: isoamyl acetate (banana, fruity).
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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 yolk
- Emulsifies the oil and water-based ingredients, holding the sauce together and giving it body.
- Olive oil
- Forms the fat phase of the emulsion, giving the dressing its richness and thick texture.
- Mixed mustard
- Helps stabilise the emulsion so the oil stays dispersed instead of separating.
- Vinegar or lemon juice
- Adds acidity that brightens the flavour and thins the sauce to the desired consistency.
The step that matters
Adding the olive oil gradually while stirring steadily in one direction. Oil must be dispersed into the egg yolk in small amounts so droplets are surrounded by emulsifier. Adding it too fast overwhelms the yolk, and the mixture breaks into separated oil and liquid.
Swap the mustard
How well each one fits the dish's main ingredients (pepper, egg, olive, vinegar, cream):
- Capsicumfits better
- Spinachfits about as well
- Mustardthe original
- Cucumberfits about as well
Fit is the average pairing score against pepper, egg, olive, 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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