Why it works: Mustard and onion match in chemistry and in kitchens. They rank in the top 6% of all ingredient pairs, and cooks put them together in 9,259 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Deviled Eggs
Ingredients
Directions
Prepare
Cut the hard-boiled eggs in half and remove the yolks.
Mash the yolks finely.
Make the filling
Add prepared mustard, grated onion, salt, and pepper to the mashed yolks.
Moisten the mixture with vinegar until it reaches a dry paste consistency.
Fill the egg halves with the yolk mixture.
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 + oniontop 6% of all pairsSmell alikestrongCooked together9,259 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Mustard + vinegartop 7% of all pairsSmell alikemoderateCooked together14,067 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Mustard + peppertop 9% of all pairsSmell alikemoderateCooked together15,430 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Onion + peppertop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Onion + vinegartop 14% of all pairsSmell alikemoderateCooked together18,226 recipes
Shared aroma: acetic acid (sour, vinegar).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Egg yolks
- Form the creamy base of the filling and carry most of the richness.
- Prepared mustard
- Adds sharp flavour that balances the richness of the yolks.
- Grated onion
- Adds aroma and a sharp, savoury bite to the filling.
- Vinegar
- Adds acidity and moisture so the yolks form a spreadable paste.
The step that matters
Moisten the mixture with vinegar until it reaches a dry paste consistency. Yolks alone are crumbly and dense. Adding liquid gradually lets the fat and yolk particles bind into a smooth paste. Too much vinegar makes the filling loose and watery, so add it a little at a time.
Swap the onion
How well each one fits the dish's main ingredients (egg, mustard, pepper, vinegar):
- Horseradishfits better
- Capsicumfits better
- Shallotfits better
- Onionthe original
Fit is the average pairing score against egg, mustard, pepper, 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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