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 ↓
Mayonnaise Sauce
Ingredients
Directions
Make the emulsion
Pass the raw and hard-boiled egg yolks through a wire sieve into a bowl.
Add the mixed mustard and coarse sea salt, and mix well.
Slowly add the salad oil drop by drop, stirring with a wooden spoon until thick.
Finish and flavour
Once thick, add the chili or tarragon vinegar and incorporate more oil until desired consistency is reached.
For fish, mix in the anchovy sauce, chopped capers, and chives.
For salad, mix in the chopped parsley, chives, and tarragon.
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.
Photo for illustrative purposes only · Contact us to use it
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.
-
Mustard + caperstop 1% of all pairsSmell alikestrongCooked together624 recipes
Shared aroma: coumarin (sweet, hay).
-
Capers + chivetop 1% of all pairsSmell alikestrongCooked together245 recipes
Shared aroma: coumarin (sweet, hay).
-
Tarragon + caperstop 1% of all pairsSmell alikestrongCooked together379 recipes
Shared aroma: coumarin (sweet, hay).
-
Mustard + tarragontop 1% of all pairsSmell alikestrongCooked together901 recipes
Shared aroma: methyleugenol (clove, spice).
-
Tarragon + chivetop 1% of all pairsSmell alikestrongCooked together589 recipes
Shared aroma: coumarin (sweet, hay).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Egg yolks
- Lecithin in the yolks emulsifies the oil and water, holding the sauce together as a thick emulsion.
- Salad oil
- Supplies the fat that, dispersed in droplets, gives mayonnaise its thick, rich body.
- Mixed mustard
- Its particles help stabilise the emulsion and add sharpness.
- Chili or tarragon vinegar
- Adds acidity that brightens flavour and helps keep the emulsion stable.
The step that matters
Adding the oil slowly, drop by drop, at the start. Oil must be dispersed into the yolk one drop at a time so the emulsion forms. Adding it too fast breaks the mixture, leaving it runny and separated.
“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.
More mayonnaise recipes
You might also like
The free Flavor Lab newsletter: one surprising pairing a week and the molecular reason it works, in 60 seconds. No spam, unsubscribe anytime.
Prefer an account? Create a free account to save pairings and unlock the full chemistry.

Mixed Mustard9 recipes
Wine Sauce (for stewed fruit)186 recipes
Caper Sauce180 recipes
Brown Sauce141 recipes