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
Mix the dry ingredients: mustard, salt, cayenne, and fruit sugar.
Add the egg yolk and beat thoroughly with a wooden spoon or Dover beater.
Add a few drops of oil and beat thoroughly.
Add a few drops of lemon juice or vinegar.
Continue adding lemon juice and about half of the oil.
Add the remaining oil in larger quantities.
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 + 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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Lemon + sugartop 18% of all pairsSmell alikelowCooked together53,532 recipes
Shared aroma: 2-nonenal (fatty, green).
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Lemon + eggtop 19% of all pairsSmell alikelowCooked together44,316 recipes
Shared aroma: (e,e)-2,4-decadienal (fatty, deep fried).
Lemon and sugar barely smell alike, yet cooks put them together in 53,532 recipes: they work on texture and structure more than aroma.
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Egg yolk
- Emulsifies the oil and lemon juice, holding the mixture together as a thick dressing.
- Salad oil
- Supplies the fat that, dispersed into droplets, gives the dressing its rich body.
- Lemon juice or vinegar
- Adds acidity that balances the richness and helps stabilise the emulsion.
- Mustard
- Contains natural emulsifiers that help keep the oil and liquid from separating.
The step that matters
Adding the oil slowly at the start. Oil must be added a few drops at a time while beating so it disperses into tiny droplets surrounded by egg yolk. Adding it too fast before the emulsion forms can make the mixture break and separate.
Swap the mustard
How well each one fits the dish's main ingredients (pepper, lemon, egg, sugar):
- Capsicumfits better
- Asparagusfits better
- Spinachfits better
- Mustardthe original
Fit is the average pairing score against pepper, lemon, egg, sugar. 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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