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
Make the base
Beat the yolk of one egg in a small bowl.
Slowly add 1 pint of cold olive oil while stirring or beating gently for about 1 hour.
Season and emulsify
In a separate bowl, mix ½ teaspoon mustard, ½ teaspoon salt, ½ teaspoon powdered sugar, and a few grains of cayenne.
Add 1 tablespoon each of lemon juice and vinegar to the dry ingredients and blend thoroughly.
Combine the seasoning mixture with the beaten egg yolk and beat until slightly thickened.
Add the olive oil a few drops at a time while continuing to beat.
Once it begins to thicken, add the oil in larger quantities until the dressing is sufficiently heavy.
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).
-
Mustard + vinegartop 7% of all pairsSmell alikemoderateCooked together14,067 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Olive + lemontop 7% of all pairsSmell alikemoderateCooked together11,922 recipes
Shared aroma: 3-hexenal (apple, fruity).
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Olive + mustardtop 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 yolk
- Lecithin in the yolk emulsifies the oil and water, holding the dressing together.
- Olive oil
- Forms the droplets that give the dressing its rich body and fat-based texture.
- Mustard
- Helps stabilise the emulsion so the oil and lemon juice stay blended.
- Lemon juice
- Adds acidity that brightens the dressing and balances the richness of the oil.
- Vinegar
- Adds acidity that sharpens flavour and helps keep the emulsion stable.
The step that matters
Adding the oil slowly at the start. Oil must be added a few drops at a time while beating, so each droplet is coated by yolk before more oil enters. Adding too much early breaks the emulsion and the dressing separates.
Swap the mustard
How well each one fits the dish's main ingredients (egg, olive, sugar, pepper, lemon, vinegar):
- Capsicumfits better
- Mustardthe original
- Cucumberfits about as well
- Spinachfits about as well
Fit is the average pairing score against egg, olive, sugar, 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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