Why it works: Pepper and parsley 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 ↓
Swiss Eggs
Ingredients
Directions
The book says “a quick oven”. The 400°F (200°C) in the steps is the modern equivalent, not the book's own figure.
Prepare
Preheat the oven to 400°F (200°C).
Spread the butter on the bottom of a fire‑proof porcelain dish.
Layer the Gruyère cheese slices on top of the butter.
Bake and serve
Crack the eggs over the cheese, keeping the yolks whole.
Sprinkle with mignonette pepper and salt.
Mix the chopped parsley with the grated Gruyère cheese and strew over the eggs.
Bake for 10 to 12 minutes.
Serve in the dish they were baked in.
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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Pepper + parsleytop 2% of all pairsSmell alikestrongCooked together34,122 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Butter + gruyere cheesetop 9% of all pairsSmell alikemoderateCooked together323 recipes
Shared aroma: gamma-decalactone (peach, creamy).
-
Butter + parsleytop 15% of all pairsSmell alikemoderateCooked together28,563 recipes
Shared aroma: trans-2-hexenal (green, leafy).
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Butter + eggtop 17% of all pairsSmell alikemoderateCooked together118,967 recipes
Shared aroma: decanal (soap, orange peel).
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Gruyere cheese + eggtop 17% of all pairsSmell alikemoderateCooked together200 recipes
Shared aroma: 1-octen-3-ol (mushroom, earthy).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Eggs
- Set to a soft, tender structure while the yolks stay whole and runny.
- Gruyère cheese
- Melts into a savoury layer that browns and binds to the eggs.
- Butter
- Coats the dish and adds richness, preventing the cheese from sticking.
The step that matters
Crack the eggs over the cheese, keeping the yolks whole.. Eggs cook quickly in a hot oven, so overbaking sets the yolks firm. Keeping yolks intact and removing the dish from the oven at the right moment preserves a runny centre while the whites set.
Swap the parsley
How well each one fits the dish's main ingredients (butter, gruyere cheese, egg, pepper):
- Nutmegfits about as well
- Parsleythe original
- Thymefits about as well
- Tarragonfits less well
Fit is the average pairing score against butter, gruyere cheese, egg, 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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