Why it works: Onion and chicken are a kitchen classic. They rank in the top 8% of all ingredient pairs, and cooks put them together in 17,814 recipes. Both carry gamma-nonanolactone, which smells coconut, sweet. The science ↓
Onion Omelet
Ingredients
Directions
Make the soubise
Peel, blanch, and boil the onions until tender, then drain and chop finely.
In a saucepan, combine the chopped onions with enough seasoned stock to cover and reduce to a stiff puree.
Pass the mixture through a fine sieve and mix with Mornay sauce and seasoning.
Assemble the omelette
Prepare a plain omelet in the usual way.
Heat the soubise puree and place it in the center of the omelet just 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 their aromas overlap, and how often cooks already put them together.
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Onion + chickentop 8% of all pairsSmell alikemoderateCooked together17,814 recipes
Shared aroma: gamma-nonanolactone (coconut, sweet).
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Onion + peppertop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Chicken + peppertop 16% of all pairsSmell alikemoderateCooked together19,958 recipes
Shared aroma: piperonal (bitter, coconut).
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Onion + saucetop 19% of all pairsSmell alikelowCooked together10,474 recipes
Shared aroma: ethanol (alcoholic, ethereal).
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Chicken + saucetop 23% of all pairsSmell alikelowCooked together4,513 recipes
Shared aroma: ethanol (alcoholic, ethereal).
Onion and sauce barely smell alike, yet cooks put them together in 10,474 recipes: they 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
- Onions
- Provide the main flavour and, when reduced, a thick, sweet puree base.
- Seasoned chicken or veal stock
- Moistens the onions so they reduce into a smooth, stiff puree.
- Mornay sauce
- Adds richness and a creamy body to the soubise filling.
The step that matters
Reducing the onion puree. If the onions are not reduced enough, the puree stays wet and can leak into the omelette. Cooking off the liquid concentrates the flavour and gives a stiff, spoonable texture that holds its place in the centre.
Swap the onion
How well each one fits the dish's main ingredients (chicken, sauce, pepper):
- Capsicumfits better
- Tomatofits better
- Mustardfits about as well
- Onionthe original
Fit is the average pairing score against chicken, sauce, 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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