Why it works: Onion and parsley are a kitchen classic. They rank in the top 9% of all ingredient pairs, and cooks put them together in 25,843 recipes. Both carry 2,4-decadienal, which smells seaweed. The science ↓
French Eggs
Ingredients
Directions
Prepare the eggs
Boil the eggs hard, then cut them lengthwise and remove the yolks.
Place the egg whites on a platter to keep warm.
Make and fill
Mash the yolks until smooth, then mix in the minced onion, parsley, salt, and vinegar.
Fill each half of the egg white with the yolk mixture.
Finish
Pour drawn butter or white sauce over the filled egg whites.
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 + parsleytop 9% of all pairsSmell alikemoderateCooked together25,843 recipes
Shared aroma: 2,4-decadienal (seaweed).
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Onion + vinegartop 14% of all pairsSmell alikemoderateCooked together18,226 recipes
Shared aroma: acetic acid (sour, vinegar).
-
Onion + buttertop 15% of all pairsSmell alikemoderateCooked together42,912 recipes
Shared aroma: decanal (soap, orange peel).
-
Parsley + buttertop 15% of all pairsSmell alikemoderateCooked together28,563 recipes
Shared aroma: trans-2-hexenal (green, leafy).
-
Parsley + vinegartop 16% of all pairsSmell alikemoderateCooked together6,477 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Eggs
- Yolks become a smooth filling, while whites form the edible cups holding it.
- Drawn butter or white sauce
- Adds richness and moisture to the filling and gives the finished eggs a smooth, glossy coating.
- Onion
- Adds a sharp, aromatic bite that balances the richness of the yolks.
- Vinegar
- Adds acidity that brightens the flavor of the rich yolk filling.
The step that matters
Mashing the yolks until smooth. Lumps of yolk stay dry and crumbly, so the filling will not pipe or spoon evenly. Mashing the yolks thoroughly while they are still fresh-cooked gives a creamy texture, and adding the liquid seasonings gradually helps the mixture come together without becoming runny.
Swap the onion
How well each one fits the dish's main ingredients (egg, parsley, vinegar, butter):
- Shallotfits better
- Chivefits better
- Cucumberfits better
- Onionthe original
Fit is the average pairing score against egg, parsley, vinegar, 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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