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 ↓
Mayonnaise Dressing
Ingredients
Directions
In a cold bowl, rub the raw egg yolks and hard-boiled yolks until smooth.
Gradually add the oil, a few drops at a time, mixing well.
Once the oil is well mixed and has a jelly-like consistency, add the salt, pepper, and mustard.
Slowly incorporate the vinegar, mixing until the mayonnaise is the thickness of thick cream.
If it looks like curdling, chill in the refrigerator for 40 minutes and mix again.
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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Pepper + mustardtop 9% of all pairsSmell alikemoderateCooked together15,430 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Pepper + vinegartop 14% of all pairsSmell alikemoderateCooked together27,814 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Egg + mustardtop 28% of all pairsSmell alikemoderateCooked together9,210 recipes
Shared aroma: (e)-2-octenal (fatty, green).
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Egg + vinegartop 33% of all pairsSmell alikelowCooked together12,922 recipes
Shared aroma: acetic acid (sour, vinegar).
Egg and vinegar barely smell alike, yet cooks put them together in 12,922 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 yolks
- Emulsifiers that hold the oil and vinegar together, giving the mayonnaise its body.
- Oil
- Supplies the fat that, dispersed in droplets, thickens the sauce into a rich texture.
- Vinegar
- Adds acidity that brightens the flavour and helps stabilise the emulsion.
- Mustard
- Its natural compounds help stabilise the emulsion and add a sharp, savoury note.
The step that matters
Adding the oil gradually. Oil must be added a few drops at a time so it breaks into tiny droplets that the egg yolk lecithin can coat. Adding it too fast overwhelms the yolks, so the emulsion breaks and the mayonnaise curdles.
Swap the mustard
How well each one fits the dish's main ingredients (egg, pepper, vinegar):
- Capsicumfits better
- Mustardthe original
- Cucumberfits about as well
- Cabbagefits less well
Fit is the average pairing score against egg, 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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