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 dressing
Warm the vinegar in a saucepan.
In a bowl, combine the egg yolks, celery seed, mustard, mashed capers, sugar, pepper, and salt.
Gradually add the warm vinegar to the mixture, stirring continuously.
Cook over low heat until thickened, stirring constantly.
Serve
Serve with canned salmon or use as a dressing for deviled ham.
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 + parsleytop 1% of all pairsSmell alikestrongCooked together1,550 recipes
Shared aroma: coumarin (sweet, hay).
-
Celery + parsleytop 1% of all pairsSmell alikestrongCooked together6,810 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
-
Celery + mustardtop 2% of all pairsSmell alikemoderateCooked together4,169 recipes
Shared aroma: guaiacol (smoky, sweet).
-
Pepper + parsleytop 2% of all pairsSmell alikestrongCooked together34,122 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Egg yolks
- Provide emulsifying and thickening proteins that set the dressing as it cooks.
- Vinegar
- Adds acidity that brightens flavour and balances the richness of the yolks.
- Mustard
- Adds sharp flavour and helps stabilise the emulsion.
- Sugar
- Adds sweetness that rounds out the sharpness of the vinegar and mustard.
The step that matters
Cook over low heat while stirring constantly. Egg yolks thicken as they warm, but too much heat can scramble them into lumps. Gentle, constant stirring spreads the heat evenly so the mixture thickens smoothly.
Swap the celery
How well each one fits the dish's main ingredients (vinegar, egg, mustard, capers, sugar, pepper, parsley):
- Tarragonfits better
- Dillfits better
- Thymefits about as well
- Celerythe original
Fit is the average pairing score against vinegar, egg, mustard, capers, sugar, pepper, parsley. 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.
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.

Raspberry Vinegar214 recipes
Sugar Vinegar20 recipes
Vegetable Soup350 recipes
Brown Coffee with Egg175 recipes