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 ↓
Salad Dressings, to Make Cold
Ingredients
Directions
Make the dressing
In a soup plate, mix the mustard and salt with enough vinegar to form a paste using a fork.
Add the egg yolk and stir thoroughly.
Gradually add the sweet oil or melted butter, one teaspoon at a time, while mixing continuously.
If the dressing becomes too thick, add a teaspoon of vinegar as needed.
Continue adding oil or butter and vinegar until you reach the desired quantity and consistency.
Season and serve
Taste and adjust seasoning with more salt or vinegar if necessary.
Pour the dressing over chopped cold potatoes or other cold dishes and mix well.
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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Egg + buttertop 17% of all pairsSmell alikemoderateCooked together118,967 recipes
Shared aroma: decanal (soap, orange peel).
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Mustard + buttertop 22% of all pairsSmell alikemoderateCooked together8,003 recipes
Shared aroma: guaiacol (smoky, sweet).
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Vinegar + buttertop 23% of all pairsSmell alikemoderateCooked together13,513 recipes
Shared aroma: isoamyl acetate (banana, pear).
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Mustard + eggtop 28% of all pairsSmell alikemoderateCooked together9,210 recipes
Shared aroma: (e)-2-octenal (fatty, green).
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 and vinegar so the dressing stays thick and smooth.
- Ground mustard
- Helps stabilise the emulsion and adds a sharp, pungent flavour.
- Sweet oil or melted butter
- Provides fat that gives the dressing body and a rich mouthfeel.
- Vinegar
- Adds acidity that brightens the flavour and balances the richness of the fat.
The step that matters
Adding the oil or butter gradually. Adding fat slowly while mixing lets the egg yolk and mustard break it into tiny droplets. Adding it too fast can split the dressing into separated oil and liquid.
Swap the mustard
How well each one fits the dish's main ingredients (vinegar, egg, butter):
- Cucumberfits about as well
- Shallotfits about as well
- Mustardthe original
- Chivefits about as well
Fit is the average pairing score against vinegar, egg, butter. 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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