Why it works: Parsley and pepper match in chemistry and in kitchens. They rank in the top 2% of all ingredient pairs, and cooks put them together in 34,122 recipes. Both carry 4'-methylacetophenone, which smells bitter almond. The science ↓
A Large Omelet
Ingredients
Directions
Prepare the filling
Beat the eggs until frothy.
Add the chopped onions and minced parsley to the eggs.
Season with pepper and coarse sea salt.
Cook and serve
Heat butter in a frying pan over medium-high heat.
Pour the egg mixture into the pan and cook for 5 minutes until set.
Fold the omelet in half and serve hot.
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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Parsley + peppertop 2% of all pairsSmell alikestrongCooked together34,122 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Onion + parsleytop 9% of all pairsSmell alikemoderateCooked together25,843 recipes
Shared aroma: 2,4-decadienal (seaweed).
-
Onion + peppertop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Onion + buttertop 15% of all pairsSmell alikemoderateCooked together42,912 recipes
Shared aroma: decanal (soap, orange peel).
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Parsley + buttertop 15% of all pairsSmell alikemoderateCooked together28,563 recipes
Shared aroma: trans-2-hexenal (green, leafy).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Eggs
- Set into a firm structure when heated, forming the body of the omelet.
- Onions
- Add savory sweetness and aroma as they cook into the eggs.
- Parsley
- Adds fresh, green aroma and a light herbal flavor.
The step that matters
Cooking the egg mixture until set. Eggs turn from liquid to solid as their proteins coagulate with heat. Cooking too long or on too high heat makes them tough and dry, while stopping too early leaves them runny in the middle.
Swap the onion
How well each one fits the dish's main ingredients (egg, parsley, pepper, butter):
- Shallotfits better
- Chivefits better
- Carrotfits better
- Onionthe original
Fit is the average pairing score against egg, parsley, pepper, butter. 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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