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 emulsion
Combine the egg yolks, salt, red pepper, mustard, and vinegar in a bowl and mix well.
Slowly add the olive oil drop by drop while stirring, as you would for mayonnaise.
Add the juice of half a lemon to flavor the mixture.
Add the chopped ingredients
Finely chop the sour pickles, onion, capers, garlic, parsley, and cloves.
Add the chopped ingredients to the sauce and stir well before serving.
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).
-
Pepper + lemontop 3% of all pairsAroma overlapstrongMentioned together27,047 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
-
Lemon + caperstop 5% of all pairsAroma overlapstrongMentioned together1,222 recipes
Shared aroma: coumarin (sweet, hay).
-
Mustard + oniontop 6% of all pairsAroma overlapstrongMentioned together9,259 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
- Emulsify the oil and vinegar so the sauce holds together thick and smooth.
- Olive oil
- Provides the rich fat that gives the sauce its body and mouthfeel.
- Vinegar
- Adds sharp acidity that cuts through the richness of the oil and yolks.
- Mustard
- Helps stabilize the emulsion and adds a sharp, tangy bite.
- Sour pickles
- Contribute acidity and crunch that give the sauce its characteristic tang.
The step that matters
Adding the olive oil. Oil must be added drop by drop while whisking so the yolks can disperse it into tiny droplets. Adding it too fast breaks the emulsion, leaving a greasy, separated sauce.
Flavor stand-ins for the onion
How well each one fits the dish's main ingredients (olive, egg, pepper, mustard, vinegar, lemon, capers):
- Shallotbetter flavor fit
- Horseradishbetter flavor fit
- Lettucebetter flavor fit
- Onionthe original
Fit is the average pairing score against olive, egg, pepper, mustard, vinegar, lemon, 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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