Why it works: Parsley and lemon match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 14,037 recipes. Both carry beta-phellandrene, which smells minty, terpene. The science ↓
Sauce Tartare
Ingredients
Directions
Make the emulsion
In a bowl, mix the mustard, salt, and cayenne pepper.
Add the egg yolks and stir until well combined.
Gradually add the olive oil, starting with a few drops while beating constantly.
Thin the mixture with vinegar.
Add the lemon juice.
Chill and finish
Chill thoroughly before serving.
Just before serving, fold in the olives, onion, pickles, parsley, and remaining lemon juice.
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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Parsley + lemontop 1% of all pairsSmell alikestrongCooked together14,037 recipes
Shared aroma: beta-phellandrene (minty, terpene).
-
Pepper + parsleytop 2% of all pairsSmell alikestrongCooked together34,122 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
-
Pepper + lemontop 3% of all pairsSmell alikestrongCooked together27,047 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
-
Olive + parsleytop 6% of all pairsSmell alikestrongCooked together9,649 recipes
Shared aroma: 2,4-decadienal (seaweed).
-
Mustard + oniontop 6% of all pairsSmell alikestrongCooked 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 water in the sauce, giving it a thick, creamy body.
- Olive oil
- Forms the bulk of the sauce and gives it richness and body when emulsified.
- Mustard
- Helps stabilise the emulsion and adds sharp, pungent flavour.
- Vinegar
- Adds acidity that brightens the sauce and balances the richness of the oil.
- Lemon juice
- Adds acidity and fresh flavour that cuts through the richness of the oil.
- Olives
- Add briny, salty flavour and a chopped texture to the sauce.
The step that matters
Adding the olive oil gradually. Oil must be added a few drops at a time while beating constantly so the yolks can emulsify it. Adding it too fast breaks the emulsion, leaving the sauce oily and separated.
Flavor stand-ins for the onion
How well each one fits the dish's main ingredients (mustard, egg, olive, pepper, vinegar, parsley, lemon):
- Shallotbetter flavor fit
- Broccolibetter flavor fit
- Lettucebetter flavor fit
- Onionthe original
Fit is the average pairing score against mustard, egg, olive, pepper, vinegar, parsley, lemon. 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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