Why it works: Lettuce and onion match in chemistry and in kitchens. They rank in the top 8% of all ingredient pairs, and cooks put them together in 3,562 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Lettuce Salad
Ingredients
Directions
Prepare
Dress the lettuce and mix it well with salad oil.
Beat the egg yolks in a bowl.
Make the dressing
Add the finely chopped onion, salt, and sugar to the egg yolks and stir well.
Pour in the vinegar and mix thoroughly.
Pour the dressing over the lettuce.
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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Lettuce + oniontop 8% of all pairsSmell alikestrongCooked together3,562 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Onion + vinegartop 14% of all pairsSmell alikemoderateCooked together18,226 recipes
Shared aroma: acetic acid (sour, vinegar).
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Lettuce + vinegartop 14% of all pairsSmell alikemoderateCooked together2,370 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Sugar + vinegartop 15% of all pairsSmell alikemoderateCooked together20,806 recipes
Shared aroma: beta-damascenone (apple, rose).
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Egg + sugartop 21% of all pairsSmell alikemoderateCooked together122,807 recipes
Shared aroma: 2-nonenal (fatty, green).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Egg yolks
- Emulsify the oil and vinegar, giving the dressing a thick, creamy body.
- Salad oil
- Adds fat and smooth mouthfeel, carrying flavor across the leaves.
- Vinegar
- Adds sharpness that balances the sugar and richness of the yolks.
- White sugar
- Sweetness that rounds out the acidity of the vinegar.
- Lettuce
- Provides the crisp, watery base that the dressing coats.
The step that matters
Stir the onion, salt and sugar into the yolks before adding vinegar. Dissolving the sugar and salt in the yolks first gives an even, well-seasoned base. Adding vinegar too early or without stirring can leave the dressing uneven and grainy.
Swap the onion
How well each one fits the dish's main ingredients (lettuce, egg, sugar, vinegar):
- Mustardfits better
- Cucumberfits better
- Beetrootfits better
- Onionthe original
Fit is the average pairing score against lettuce, egg, sugar, 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.
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