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 ↓
French Dressing
Ingredients
Directions
Make the dressing
Place a small funnel in the neck of a glass bottle with a ground‑glass stopper.
Add the dry ingredients first, then the vinegar, and finally the olive oil.
Remove the funnel, cork the bottle, and shake vigorously until the dressing thickens.
Store and serve
Pour off the desired amount, recork the bottle, and store in a cold place.
Shake well before each use.
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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Olive + mustardtop 8% of all pairsSmell alikestrongCooked together5,950 recipes
Shared aroma: eucalyptol (eucalyptus, herbal).
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Mustard + peppertop 9% of all pairsSmell alikemoderateCooked together15,430 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Olive + vinegartop 10% of all pairsSmell alikemoderateCooked together12,297 recipes
Shared aroma: isoamyl acetate (banana, fruity).
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Olive + peppertop 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
- Olive oil
- Supplies the fat and smooth body that makes up most of the dressing.
- Vinegar
- Provides the sharp acidity that balances the rich oil.
- Mustard
- Its natural compounds help hold the oil and vinegar together as an emulsion.
- Powdered sugar
- Adds a little sweetness to soften the vinegar's sharpness.
The step that matters
Shake vigorously until the dressing thickens. Oil and vinegar naturally separate. Vigorous shaking breaks the oil into tiny droplets dispersed in the vinegar, and the mustard helps keep them suspended. Shaking too gently leaves the dressing split and oily.
Swap the mustard
The recipe marks mustard as optional. How well each one fits the dish's main ingredients (olive, vinegar, sugar, pepper):
- Capsicumfits better
- Mustardthe original
- Tomatofits about as well
- Cucumberfits less well
Fit is the average pairing score against olive, vinegar, sugar, pepper. 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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