Why it works: Pepper and lemon match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and cooks put them together in 27,047 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓
Mayonnaise Dressing
Ingredients
Directions
In a bowl, mix the mustard, salt, powdered sugar, and cayenne pepper.
Add the egg yolks and mix well.
Gradually add the lemon juice and vinegar.
Slowly drizzle in the olive oil, starting drop by drop, while stirring constantly.
As the mixture thickens, thin it out with additional vinegar or lemon juice.
Continue to alternate adding oil and vinegar or lemon juice until all ingredients are used, stirring or beating constantly.
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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Pepper + lemontop 3% of all pairsSmell alikestrongCooked together27,047 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Mustard + vinegartop 7% of all pairsSmell alikemoderateCooked together14,067 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Lemon + olivetop 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).
-
Mustard + peppertop 9% of all pairsSmell alikemoderateCooked together15,430 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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 acid into a stable, thick sauce.
- Olive oil
- Supplies the fat that forms the rich, creamy body of the sauce.
- Mustard
- Helps hold the oil and water-based ingredients together as an emulsion.
- Lemon juice
- Adds acidity that brightens flavour and helps thin the sauce as it thickens.
The step that matters
Adding the oil slowly at the start. Oil must be dispersed into tiny droplets around the egg yolk emulsifiers. Adding it drop by drop while stirring constantly lets the emulsion form. Pouring too fast causes the mixture to break and separate into oily liquid.
Swap the mustard
How well each one fits the dish's main ingredients (sugar, pepper, egg, lemon, vinegar, olive):
- Capsicumfits better
- Mustardthe original
- Cucumberfits about as well
- Spinachfits about as well
Fit is the average pairing score against sugar, pepper, egg, lemon, vinegar, olive. 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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