Why it works: Pepper and parsley match in chemistry and in kitchens. They rank in the top 2% of all ingredient pairs, and 34,118 recipes mention both. Both carry 4'-methylacetophenone, which smells bitter almond. The science ↓
The recipe
Ingredients
Contains: egg, milk, fish (auto-detected from the ingredients and method; we can miss things, so check labels)
Also mentioned in the method: fish
Directions
The book says “a sharp oven”. The 400°F (200°C) in the steps is the modern equivalent, not the book's own figure.
Prepare the fish
Butter a shallow fireproof or tin dish and lay the whole sole in it.
Cover with buttered paper and bake in a 400°F (200°C) oven for 10 minutes.
Stuff and sauce
Remove from the oven and carefully take out the backbone, filling the cavity with chopped onions and parsley.
Replace the upper side of the fish and cover with white sauce.
Return to the oven for an additional 10 to 15 minutes.
Garnish and serve
Prepare the eggs by cutting the whites into quarters for garnish and pressing the yolks through a coarse sieve.
Once the fish is cooked, sprinkle the top with the yolks and return to the oven for 2 minutes to heat through.
Decorate the edges of the dish with the egg whites, sliced lemon, and parsley.
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 aroma chemistry they share, and how many recipes mention both.
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Pepper + parsleytop 2% of all pairsAroma overlapstrongMentioned together34,118 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Parsley + oniontop 6% of all pairsAroma overlapstrongMentioned together25,834 recipes
Shared aroma: coumarin (sweet, hay).
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Pepper + oniontop 6% of all pairsAroma overlapmoderateMentioned together68,463 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Butter + oniontop 7% of all pairsAroma overlapmoderateMentioned together42,827 recipes
Shared aroma: guaiacol (smoky, sweet).
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Butter + parsleytop 8% of all pairsAroma overlapmoderateMentioned together28,543 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
- Sole
- Forms the main body of the dish, cooked gently whole in the dish.
- Butter
- Adds richness and helps keep the fish moist while it bakes.
- White sauce
- Covers the fish with a creamy layer that keeps it moist as it heats.
- Hard-boiled eggs
- Provide a rich, crumbly yolk topping and white garnish.
The step that matters
Returning the fish to the oven after saucing. Fish cooks quickly and turns dry and rubbery if overbaked, so check it is just opaque and flaking before adding the yolks and heating briefly.
Flavor stand-ins for the onion
How well each one fits the dish's main ingredients (butter, pepper, parsley, sauce, egg):
- Capsicumbetter flavor fit
- Carrotbetter flavor fit
- Potatobetter flavor fit
- Onionthe original
Fit is the average pairing score against butter, pepper, parsley, sauce, egg. Candidates are from the same food group and used in at least 100 recipes. This compares flavor only: it does not check the job the ingredient does in the dish (bulk, moisture, acidity, structure).
“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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