Why it works: Mustard and vinegar 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 ↓
French Mayonnaise Sauce
Ingredients
Directions
Prepare the yolks
Boil the eggs for 20 minutes, then cool and remove the yolks.
Pulverize the yolks and add the two raw yolks, stirring until smooth.
Make the mayonnaise
Slowly pour in the olive oil, drop by drop, while stirring continuously in the same direction.
Season and finish
In a separate bowl, dissolve the mustard in a little cold water.
Add the salt, black pepper, red pepper, and vinegar to the mustard mixture.
Slowly pour the mixture into the mayonnaise, stirring and adjusting seasoning to taste.
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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Mustard + vinegartop 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).
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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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Olive + vinegartop 10% of all pairsSmell alikemoderateCooked together12,297 recipes
Shared aroma: isoamyl acetate (banana, fruity).
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Olive + peppertop 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
- Raw egg yolks
- Emulsify the oil and water so the sauce thickens and holds together.
- Hard boiled eggs
- Add body and a creamy texture to the pulverized base.
- Olive oil
- Provides fat that, emulsified, gives the sauce its rich body.
- Vinegar
- Adds acidity that brightens the sauce and balances the richness of the oil.
- English mustard
- Helps stabilise the emulsion and adds sharp flavour.
The step that matters
Adding the oil. Oil must be added slowly while stirring steadily in one direction so droplets disperse finely into the yolk. Adding it too fast breaks the emulsion, leaving the sauce thin and oily.
Swap the mustard
How well each one fits the dish's main ingredients (egg, olive, pepper, vinegar):
- Capsicumfits better
- Cucumberfits about as well
- Tomatofits about as well
- Mustardthe original
Fit is the average pairing score against egg, olive, pepper, 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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