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 ↓
A Simple Mayonnaise Dressing
Ingredients
Directions
Make the base
In a bowl, combine the egg yolk, dry mustard, white pepper, cayenne pepper, and lemon juice.
Mix with a wooden spoon until creamy and white.
Emulsify and finish
Slowly add the salad oil drop by drop while stirring constantly.
If the mixture thickens too quickly, add a little juice from the other half of the lemon.
Gradually stir in the strong vinegar.
Keep cool until ready to use.
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).
-
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 yolk
- Its lecithin emulsifies the oil and vinegar, holding the dressing together as a thick sauce.
- Salad oil
- Provides the fat that gives the dressing its rich body and smooth texture.
- Lemon juice
- Adds acidity that brightens the flavor and helps keep the emulsion stable.
- Strong vinegar
- Adds sharp acidity that balances the richness of the oil.
- Dry mustard
- Contains natural emulsifiers that help the oil and water-based liquids stay combined.
The step that matters
Adding the oil drop by drop. Oil must be added slowly while stirring so each droplet is fully dispersed before more is added. Adding it too fast overwhelms the egg yolk's emulsifiers, causing the mixture to break and separate.
Swap the white pepper
How well each one fits the dish's main ingredients (egg, mustard, pepper, lemon, vinegar):
- Tarragonfits better
- Dillfits better
- Parsleyfits better
- White pepperthe original
Fit is the average pairing score against egg, mustard, pepper, lemon, 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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