Why it works: Lemon and pepper 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 Sauce
Ingredients
Directions
Make the emulsion
Place the egg yolk in a cold bowl and beat it well with a fork.
Add the salt and mustard powder, mixing well for a minute.
Slowly pour in the oil, a few drops at a time, alternating with vinegar.
Continue mixing until the sauce thickens and resembles jelly.
Finish the sauce
Once thickened, alternate adding lemon juice with the remaining oil.
When the egg has absorbed about ½ cup of oil, add cayenne and vinegar to taste.
If the sauce curdles, start over with new yolks and gradually mix in the curdled sauce.
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.
Photo for illustrative purposes only · Contact us to use it
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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Lemon + peppertop 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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Vinegar + peppertop 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 water, holding the sauce together as a thick, stable emulsion.
- Oil
- Forms the bulk of the emulsion, giving the mayonnaise its rich body and fat-based texture.
- Vinegar
- Adds acidity that brightens the flavour and helps keep the emulsion stable.
- Lemon juice
- Contributes acidity and fresh flavour that balances the richness of the oil.
- Mustard powder
- Adds sharpness and helps stabilise the emulsion by supporting the egg yolk.
The step that matters
Adding the oil slowly at the start. Oil must be dispersed into the yolk in small amounts so droplets are coated by emulsifier. Pouring too fast overwhelms the yolk, and the sauce breaks and curdles.
Swap the mustard
How well each one fits the dish's main ingredients (egg, vinegar, lemon, pepper):
- Capsicumfits better
- Spinachfits about as well
- Shallotfits about as well
- Mustardthe original
Fit is the average pairing score against egg, vinegar, lemon, pepper. 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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