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 ↓
Egg Salad
Ingredients
Directions
Prepare the eggs
Boil the eggs, then shell and halve them.
Make the dressing
In a bowl, rub together the butter and flour.
Gradually add the boiling water, mixing until smooth.
Stir in the sugar, mustard, and beaten egg.
Finally, add the vinegar and pour the dressing over the halved eggs.
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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Mustard + vinegartop 7% of all pairsSmell alikemoderateCooked together14,067 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + mustardtop 13% of all pairsSmell alikemoderateCooked together5,066 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + sugartop 15% of all pairsSmell alikemoderateCooked together92,116 recipes
Shared aroma: phenylacetaldehyde (hawthorne, honey).
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Sugar + vinegartop 15% of all pairsSmell alikemoderateCooked together20,806 recipes
Shared aroma: beta-damascenone (apple, rose).
Butter and flour barely smell alike, yet cooks put them together in 124,287 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
- Eggs
- Form the main body of the salad, with the halved whites and yolks holding the dressing.
- Flour
- Thickens the dressing by absorbing the hot water into a smooth, body-giving paste.
- Butter
- Adds richness and a soft, smooth mouthfeel to the dressing.
- Beaten egg
- Enriches the dressing and adds body to its creamy texture.
- Vinegar
- Adds acidity that gives the dressing its sharp, tangy flavour.
- Sugar
- Balances the sharpness of the vinegar and mustard with a touch of sweetness.
The step that matters
Adding the boiling water to the flour and butter. Pouring the water in gradually while mixing lets the flour starch hydrate evenly, so the dressing thickens smooth instead of lumpy.
Flavor stand-ins for the mustard
How well each one fits the dish's main ingredients (egg, butter, flour, sugar, vinegar):
- Shallotabout as good a flavor fit
- Mustardthe original
- Chiveabout as good a flavor fit
- Cucumberabout as good a flavor fit
Fit is the average pairing score against egg, butter, flour, sugar, vinegar. Candidates are from the same food group and used in at least 100 recipes. This compares flavor only: it does not check the job the ingredient does in the dish (bulk, moisture, acidity, structure).
“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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