Why it works: Vinegar and mustard are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 14,067 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓
White Mayonnaise Sauce
Ingredients
Directions
In a small bowl, break up the yolk of a hard-boiled egg with a wooden spoon.
Add salt and pepper.
Stir briskly while slowly pouring in the olive oil, drop by drop.
For every eighth teaspoon of oil, add a teaspoon of white vinegar.
If desired, mix in a tablespoon of French mustard.
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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Vinegar + mustardtop 7% of all pairsSmell alikemoderateCooked together14,067 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Olive + mustardtop 8% of all pairsSmell alikestrongCooked together5,950 recipes
Shared aroma: eucalyptol (eucalyptus, herbal).
-
Pepper + mustardtop 9% of all pairsSmell alikemoderateCooked together15,430 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Olive + vinegartop 10% of all pairsSmell alikemoderateCooked together12,297 recipes
Shared aroma: isoamyl acetate (banana, fruity).
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Pepper + olivetop 11% of all pairsSmell alikemoderateCooked together30,263 recipes
Shared aroma: 2,4-decadienal (seaweed).
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 sauce together.
- Olive oil
- Supplies the fat that, dispersed in droplets, makes the sauce thick and rich.
- White vinegar
- Adds acidity that sharpens the flavor and helps stabilize the emulsion.
The step that matters
Adding the oil drop by drop while stirring. Oil must be dispersed into tiny droplets around the yolk before more is added. Pouring too fast overwhelms the yolk, so the emulsion breaks and the sauce turns oily and runny.
Swap the mustard
The recipe marks mustard as optional. How well each one fits the dish's main ingredients (egg, pepper, olive, vinegar):
- Capsicumfits better
- Cucumberfits about as well
- Tomatofits about as well
- Mustardthe original
Fit is the average pairing score against egg, pepper, olive, 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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