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
In a bowl, mix mustard and cayenne pepper.
Gradually stir in olive oil or melted butter.
Add salt and sugar, then mix well.
Incorporate the beaten eggs and mix thoroughly.
Add milk or cream and vinegar.
Cook the mixture over low heat, stirring constantly, until it thickens like soft custard.
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).
-
Mustard + olivetop 8% of all pairsSmell alikestrongCooked together5,950 recipes
Shared aroma: eucalyptol (eucalyptus, herbal).
-
Mustard + peppertop 9% of all pairsSmell alikemoderateCooked together15,430 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Olive + vinegartop 10% of all pairsSmell alikemoderateCooked together12,297 recipes
Shared aroma: isoamyl acetate (banana, fruity).
-
Pepper + olivetop 11% of all pairsSmell alikemoderateCooked together30,263 recipes
Shared aroma: 2,4-decadienal (seaweed).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Eggs
- Thicken the dressing as they set during gentle cooking, giving it a custard-like body.
- Olive oil or melted butter
- Adds fat and richness, giving the dressing a smooth, rounded mouthfeel.
- Milk or cream
- Adds moisture and richness, helping the dressing become smooth and pourable.
- Vinegar
- Adds acidity, giving the dressing its sharp, tangy flavour.
- Mustard
- Adds sharp, pungent flavour and helps emulsify the fat into the mixture.
The step that matters
Cook over low heat, stirring constantly. Egg proteins set gently around 160°F, so low heat with constant stirring thickens the custard smoothly. Higher heat or neglect can curdle the eggs into lumps.
Swap the mustard
How well each one fits the dish's main ingredients (pepper, olive, sugar, egg, milk, vinegar):
- Capsicumfits better
- Mustardthe original
- Tomatofits about as well
- Cucumberfits about as well
Fit is the average pairing score against pepper, olive, sugar, egg, milk, 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.
More salad dressing 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.

Chicken Salad623 recipes
Tomato Salad179 recipes
Cold Slaw160 recipes
French Dressing58 recipes