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
Stir the egg yolks in a small bowl with a silver or wooden spoon until smooth.
Slowly add the salad oil drop by drop while stirring continuously.
Once the mixture begins to thicken, alternate adding a few drops of vinegar and lemon juice.
If the sauce curdles, beat another egg yolk and gradually mix in the curdled mayonnaise.
Finally, add the mustard, powdered sugar, cayenne, and salt.
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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Mustard + peppertop 9% of all pairsSmell alikemoderateCooked together15,430 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Mustard + lemontop 11% of all pairsSmell alikestrongCooked together3,816 recipes
Shared aroma: eucalyptol (eucalyptus, herbal).
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Pepper + vinegartop 14% of all pairsSmell alikemoderateCooked together27,814 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Egg yolks
- Emulsify the oil and water into a thick, stable sauce.
- Salad oil
- Forms the bulk of the sauce, giving it richness and body.
- Vinegar
- Adds acidity that brightens the flavour and helps stabilise the emulsion.
- Lemon juice
- Adds acidity and fresh flavour that balances the rich oil.
- Mustard
- Acts as an extra emulsifier and adds sharpness.
The step that matters
Adding the oil slowly. Oil added too fast cannot be absorbed by the egg yolk emulsion, so it separates and the sauce curdles. Adding it drop by drop while whisking lets each droplet be surrounded and dispersed before more is added.
Swap the mustard
How well each one fits the dish's main ingredients (sugar, pepper, egg, vinegar, lemon):
- Capsicumfits better
- Mustardthe original
- Cucumberfits about as well
- Shallotfits about as well
Fit is the average pairing score against sugar, pepper, egg, vinegar, lemon. 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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