Why it works: Mustard and onion match in chemistry and in kitchens. They rank in the top 6% of all ingredient pairs, and cooks put them together in 9,259 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Ordinary Salad
Ingredients
Directions
Smash the hard-boiled yolks of eggs in a bowl with a wooden spoon.
Add mustard, pepper, and salt; mix thoroughly.
Gradually add oil, mixing until the texture is uniform.
Add Worcestershire sauce carefully, then pour in vinegar little by little.
Beat the mixture for about five minutes, then taste and adjust seasoning if necessary.
Finally, mix in the herbs and onions.
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 + oniontop 6% of all pairsSmell alikestrongCooked together9,259 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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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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Pepper + oniontop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Mustard + saucetop 13% of all pairsSmell alikemoderateCooked together2,120 recipes
Shared aroma: ethanol (alcoholic, ethereal).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Hard-boiled egg yolks
- Form the creamy base that the oil emulsifies into.
- Oil
- Adds richness and a smooth, creamy texture as it emulsifies with the yolks.
- Mustard
- Its natural emulsifiers help hold the oil and yolk mixture together.
- Vinegar
- Adds acidity that brightens the rich yolk and oil flavor.
The step that matters
Adding the oil gradually. Oil added too fast cannot be absorbed by the yolk mixture and can separate, leaving a greasy, broken texture. Adding it slowly while mixing lets the yolk lecithin coat the oil droplets and form a stable, uniform emulsion.
Swap the onion
How well each one fits the dish's main ingredients (egg, mustard, pepper, sauce, vinegar):
- Horseradishfits better
- Shallotfits better
- Capsicumfits better
- Onionthe original
Fit is the average pairing score against egg, mustard, pepper, sauce, 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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