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 ↓
Mrs. McK. Salad Dressing
Ingredients
Directions
In a bowl, combine the yolk of one raw egg with mustard, salt, and pepper. Stir well, then gradually add sweet oil while stirring briskly until thick.
Add a little vinegar, just enough to flavor without thinning the dressing.
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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Mustard + peppertop 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 yolk
- Emulsifies the oil into the mustard base, giving the dressing its thick, creamy body.
- Sweet oil
- Forms the fat phase of the dressing, supplying richness and body once emulsified.
- Mustard
- Helps stabilize the emulsion and adds sharpness to the dressing.
- Vinegar
- Adds acidity that brightens the flavor of the dressing.
The step that matters
Adding the oil gradually while stirring briskly. Oil added too fast before the yolk can absorb it will not emulsify and the dressing stays thin or separates. Slow addition with vigorous stirring lets tiny oil droplets disperse evenly in the yolk, which thickens the dressing.
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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