Why it works: Lettuce and endive match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and 284 recipes mention both. Both carry trans-2-hexenal, which smells green, leafy. The science ↓
The recipe
Ingredients
Contains: egg, milk (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Make the dressing
Boil the egg until hard, then cool and remove the yolk.
Mash the yolk with cold water and salt until smooth.
Mix in the mustard, then add the salad oil or melted butter.
Stir in the vinegar until well combined.
Assemble
Cut the salad vegetables into small pieces and mix with the dressing, or serve the dressing separately.
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 aroma chemistry they share, and how many recipes mention both.
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Lettuce + endivetop 1% of all pairsAroma overlapstrongMentioned together284 recipes
Shared aroma: trans-2-hexenal (green, leafy).
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Mustard + lettucetop 2% of all pairsAroma overlapstrongMentioned together1,356 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Mustard + celerytop 3% of all pairsAroma overlapmoderateMentioned together4,160 recipes
Shared aroma: guaiacol (smoky, sweet).
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Mustard + radishtop 3% of all pairsAroma overlapstrongMentioned together296 recipes
Shared aroma: eucalyptol (eucalyptus, herbal).
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Lettuce + celerytop 3% of all pairsAroma overlapstrongMentioned together2,033 recipes
Shared aroma: nonanal (fat, citrus).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Hard-boiled egg yolk
- Mashed into a smooth base that gives the dressing its body and richness.
- Salad oil or melted butter
- Adds fat that emulsifies with the yolk, giving the dressing a creamy, smooth texture.
- Prepared mustard
- Contributes sharp flavor and helps stabilize the emulsion.
- Vinegar
- Adds acidity that brightens the dressing and balances the richness of the fat.
The step that matters
Mashing the yolk smooth before adding fat. The yolk must be fully broken down and smooth before the oil or butter goes in. Lumps left at this point do not blend later, and the fat separates out instead of forming a creamy emulsion.
Flavor stand-ins for the radish
How well each one fits the dish's main ingredients (egg, mustard, butter, vinegar, lettuce, endive, celery):
- Cucumberbetter flavor fit
- Chivebetter flavor fit
- Broccolibetter flavor fit
- Radishthe original
Fit is the average pairing score against egg, mustard, butter, vinegar, lettuce, endive, celery. 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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