Why it works: Mustard and capers match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 624 recipes. Both carry coumarin, which smells sweet, hay. The science ↓
Salad Dressing for Fish Salad
Ingredients
Directions
Mash the yolks of the hard-boiled eggs until smooth.
Mix in the mustard, sugar, salt, cayenne, and white pepper.
Add the sardines (or capers and shallot) and incorporate thoroughly.
Gradually mix in the cream, tarragon vinegar, and lemon juice until well combined.
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 + caperstop 1% of all pairsSmell alikestrongCooked together624 recipes
Shared aroma: coumarin (sweet, hay).
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Capers + tarragontop 1% of all pairsSmell alikestrongCooked together379 recipes
Shared aroma: coumarin (sweet, hay).
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Mustard + tarragontop 1% of all pairsSmell alikestrongCooked together901 recipes
Shared aroma: methyleugenol (clove, spice).
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Pepper + tarragontop 5% of all pairsSmell alikestrongCooked together2,399 recipes
Shared aroma: estragole (anise, licorice).
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Mustard + peppertop 9% of all pairsSmell alikemoderateCooked together15,430 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Egg yolks
- Form the creamy base that emulsifies the dressing and gives it body.
- Thick cream
- Adds richness and moisture, softening the dressing's texture.
- Tarragon vinegar
- Adds acidity that brightens the dressing and balances the richness.
- Mixed mustard
- Contributes sharpness and helps bind the emulsion.
- Sardines
- Supply savory, salty flavour and fish character to the dressing.
The step that matters
Gradually mix in the cream, tarragon vinegar, and lemon juice. Adding liquids slowly lets the mashed yolks absorb them and form a stable, smooth emulsion. Dumping them in together can cause the dressing to separate or stay lumpy.
Swap the white pepper
How well each one fits the dish's main ingredients (egg, mustard, sugar, pepper, capers, cream, tarragon):
- Parsleyfits better
- Dillfits better
- Nutmegfits better
- White pepperthe original
Fit is the average pairing score against egg, mustard, sugar, pepper, capers, cream, tarragon. 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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