Why it works: Mustard and vinegar are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 14,067 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓
Salad Dressing
Ingredients
Directions
Prepare the yolks
Boil the eggs for 12 minutes, then place them in cold water until completely cool.
Rub the yolks through a sieve into a bowl.
Make the dressing
Mix in the water or cream and the oil or melted butter until well combined.
Gradually add the salt or sugar and mustard, mixing until smooth.
Slowly incorporate the vinegar, mixing thoroughly.
Garnish and serve
Chop the white of the egg and use it to garnish the salad.
Let the dressing sit at the bottom of the bowl until ready to serve.
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 + vinegartop 7% of all pairsSmell alikemoderateCooked together14,067 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Cream + buttertop 8% of all pairsSmell alikemoderateCooked together41,516 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
-
Cream + sugartop 9% of all pairsSmell alikemoderateCooked together43,450 recipes
Shared aroma: 2,3-butanedione (butter, sweet).
-
Sugar + vinegartop 15% of all pairsSmell alikemoderateCooked together20,806 recipes
Shared aroma: beta-damascenone (apple, rose).
-
Egg + buttertop 17% of all pairsSmell alikemoderateCooked together118,967 recipes
Shared aroma: decanal (soap, orange peel).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Hard-boiled eggs
- Yolks provide the rich, creamy body that the dressing is built on.
- Oil or melted butter
- Fat that emulsifies with the yolks to give the dressing a smooth, rich texture.
- Prepared mustard
- Its emulsifiers help hold the oil and liquids together in a stable dressing.
- Vinegar
- Adds acidity that sharpens the flavour and balances the richness of the yolks and fat.
The step that matters
Adding the oil or butter to the yolks. Fat must be blended into the yolks gradually and thoroughly so the mixture forms a smooth emulsion rather than separating into a greasy, broken dressing.
Swap the mustard
How well each one fits the dish's main ingredients (egg, cream, butter, sugar, vinegar):
- Mustardthe original
- Capsicumfits about as well
- Chivefits about as well
- Cucumberfits about as well
Fit is the average pairing score against egg, cream, butter, sugar, vinegar. 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.
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.

Chicken Salad623 recipes
Tomato Salad179 recipes
Cold Slaw160 recipes
Boiled Salad Dressing67 recipes