Why it works: Mustard and capers match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and 624 recipes mention both. Both carry coumarin, which smells sweet, hay. The science ↓
Tartare Sauce
Ingredients
Directions
Make the sauce
Combine the egg yolks and olive oil in a bowl, whisking until smooth.
Add the vinegar, mustard, sugar, pepper, salt, and onion juice, mixing well.
Stir in the chopped capers and cucumber pickle last.
Serve
Serve with fried or boiled fish, boiled tongue, fish salad, or with fried and broiled meats.
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 aroma chemistry they share, and how many recipes mention both.
-
Mustard + caperstop 1% of all pairsAroma overlapstrongMentioned together624 recipes
Shared aroma: coumarin (sweet, hay).
-
Olive + caperstop 3% of all pairsAroma overlapstrongMentioned together1,688 recipes
Shared aroma: coumarin (sweet, hay).
-
Mustard + oniontop 6% of all pairsAroma overlapstrongMentioned together9,259 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Onion + caperstop 7% of all pairsAroma overlapstrongMentioned together1,381 recipes
Shared aroma: coumarin (sweet, hay).
-
Vinegar + mustardtop 7% of all pairsAroma overlapmoderateMentioned together14,067 recipes
Shared aroma: isobutyraldehyde (malty, green).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Egg yolks
- Emulsify with the oil to give the sauce its thick, creamy body.
- Olive oil
- Forms the fat phase of the emulsion, adding richness and smooth texture.
- Vinegar
- Adds acidity that sharpens the flavor and balances the rich oil and yolks.
- Prepared mustard
- Helps stabilize the emulsion and adds a sharp, tangy flavor.
The step that matters
Whisking the yolks and oil until smooth. Oil must be added slowly and whisked in so tiny droplets disperse through the yolk. Adding it too fast can break the emulsion, leaving the sauce oily and separated instead of thick and creamy.
Flavor stand-ins for the onion
How well each one fits the dish's main ingredients (egg, olive, vinegar, mustard, sugar, pepper, capers):
- Shallotbetter flavor fit
- Horseradishbetter flavor fit
- Lettucebetter flavor fit
- Onionthe original
Fit is the average pairing score against egg, olive, vinegar, mustard, sugar, pepper, capers. Candidates are from the same food group and used in at least 100 recipes. This compares flavor only: it does not check the job the ingredient does in the dish (bulk, moisture, acidity, structure).
“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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