Why it works: Lettuce and mustard match in chemistry and in kitchens. They rank in the top 2% of all ingredient pairs, and 1,356 recipes mention both. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
The recipe
Ingredients
Directions
Prepare
Freshen the head of lettuce as directed.
Tear the leaves apart with your fingers and arrange them in a dish.
Make and serve
In a bowl, mix the grated onion, lemon juice, salt, powdered sugar, white pepper, and dry mustard.
Gradually stir in the oil and vinegar until well combined.
Pour the dressing over the salad before serving.
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 + mustardtop 2% of all pairsAroma overlapstrongMentioned together1,356 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Mustard + vinegartop 4% of all pairsAroma overlaplowMentioned together14,067 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Onion + mustardtop 4% of all pairsAroma overlapstrongMentioned together9,243 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Lettuce + oniontop 6% of all pairsAroma overlapstrongMentioned together3,562 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Onion + vinegartop 7% of all pairsAroma overlapmoderateMentioned together18,203 recipes
Shared aroma: acetic acid (sour, vinegar).
Mustard and vinegar share little aroma chemistry, yet 14,067 recipes mention both: they likely 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
- Lettuce
- Forms the crisp, leafy base that holds and carries the dressing.
- Oil
- Adds fat and richness, coating the leaves and carrying flavour.
- Vinegar
- Adds acidity that brightens the dressing and balances the oil.
- Lemon juice
- Adds further acidity and fresh citrus flavour to the dressing.
- Onion
- Adds pungent aroma and savoury bite to the dressing.
The step that matters
Gradually stir in the oil and vinegar. Adding the oil slowly while stirring lets it emulsify with the acidic liquids, so the dressing stays combined rather than separating into greasy and sour layers on the leaves.
Flavor stand-ins for the white pepper
How well each one fits the dish's main ingredients (lettuce, onion, lemon, sugar, mustard, vinegar):
- Tarragonbetter flavor fit
- Celerybetter flavor fit
- Dillbetter flavor fit
- White pepperthe original
Fit is the average pairing score against lettuce, onion, lemon, sugar, mustard, 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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