Why it works: Vinegar and mustard 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 ↓
Mayonnaise Dressing
Ingredients
Directions
Make the dressing
In a basin, mix the salad oil, sugar, coarse sea salt, and mustard well.
Add the well-beaten egg yolks and then the vinegar.
Finally, stir in the milk or cream.
Cook the custard
Place the basin in a saucepan with boiling water, ensuring the water surrounds it to half its depth.
Stir the mixture over heat until it thickens to a custard-like consistency.
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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Vinegar + mustardtop 7% of all pairsSmell alikemoderateCooked together14,067 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Vinegar + sugartop 15% of all pairsSmell alikemoderateCooked together20,806 recipes
Shared aroma: beta-damascenone (apple, rose).
-
Milk + eggtop 18% of all pairsSmell alikemoderateCooked together88,785 recipes
Shared aroma: 2-nonenal (fatty, green).
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Milk + sugartop 18% of all pairsSmell alikelowCooked together77,875 recipes
Shared aroma: 2-nonenal (fatty, green).
-
Sugar + mustardtop 19% of all pairsSmell alikemoderateCooked together8,424 recipes
Shared aroma: guaiacol (smoky, sweet).
Milk and sugar barely smell alike, yet cooks put them together in 77,875 recipes: they work on texture and structure more than aroma.
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Egg yolks
- Their proteins set when heated, thickening the mixture into a custard-like texture.
- Salad oil
- Adds fat, giving the dressing richness and a smooth mouthfeel.
- Vinegar
- Adds acidity, giving the dressing its sharp, tangy flavour.
- Milk or single cream
- Adds moisture and softens the texture, making the dressing lighter and smoother.
- Mustard
- Its compounds help hold the oil and liquids together, supporting a stable emulsion.
- Sugar
- Adds sweetness that balances the acidity of the vinegar.
The step that matters
Thickening over the water bath. Egg yolks thicken into a custard when heated gently. If the heat is too high, the yolks can scramble and curdle, so keep the water surrounding the basin and stir the mixture steadily while it thickens.
Swap the mustard
How well each one fits the dish's main ingredients (milk, vinegar, egg, sugar):
- Capsicumfits better
- Mustardthe original
- Cucumberfits about as well
- Sweet potatofits about as well
Fit is the average pairing score against milk, vinegar, egg, sugar. 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.
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