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
Make the emulsion
Mix the mustard with a little water to form a thick paste.
Stir in the egg yolk.
Gradually add olive oil, one teaspoon at a time, while stirring constantly with a fork.
Season and adjust
Season with vinegar, salt, cayenne, and lemon juice if desired.
If the dressing thickens too quickly, thin it with vinegar.
If it curdles, start again with a little mustard paste and another egg yolk, gradually stirring in the first mixture.
Serve
Keep the dressing on ice until served.
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).
-
Olive + lemontop 7% of all pairsSmell alikemoderateCooked together11,922 recipes
Shared aroma: 3-hexenal (apple, fruity).
-
Mustard + olivetop 8% of all pairsSmell alikestrongCooked together5,950 recipes
Shared aroma: eucalyptol (eucalyptus, herbal).
-
Olive + vinegartop 10% of all pairsSmell alikemoderateCooked together12,297 recipes
Shared aroma: isoamyl acetate (banana, fruity).
-
Mustard + lemontop 11% of all pairsSmell alikestrongCooked together3,816 recipes
Shared aroma: eucalyptol (eucalyptus, herbal).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Egg yolk
- Lecithin in the yolk emulsifies the oil and water, so the dressing becomes thick and stable.
- Olive oil
- Provides the fat that, dispersed in droplets, gives the dressing its body and richness.
- Mustard
- Mustard's compounds help stabilize the emulsion and add sharpness to the dressing.
The step that matters
Adding the olive oil. Oil must be added slowly, a little at a time, while stirring constantly so it disperses into tiny droplets. Adding it too fast overwhelms the yolk's emulsifier, and the dressing breaks or curdles.
Swap the lemon
The recipe marks lemon as optional. How well each one fits the dish's main ingredients (mustard, egg, olive, vinegar):
- Avocadofits better
- Lemonthe original
- Cherryfits about as well
- Limefits about as well
Fit is the average pairing score against mustard, egg, 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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