Why it works: Parsley and pepper 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: milk, fish (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
The book gives no oven temperature. The 400°F (200°C) in the steps was added when the recipe was transcribed, as a starting point.
Prepare the herrings
Scrape and clean the herrings.
Wrap them in buttered paper and broil until done on one side.
Turn them over and continue broiling.
Make the butter
Meanwhile, mix butter with finely chopped parsley and spring onions, adding salt and pepper.
Place some of the butter mixture in a hot dish.
Finish and serve
Remove the herrings from the paper, split them in two, and place them on the butter.
Put them in a 400°F (200°C) oven for one minute.
Cover with a hot lid and serve immediately.
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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Parsley + peppertop 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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Onion + peppertop 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
- Fresh herrings
- Forms the main body of the dish, cooking to flaky, tender flesh under the broiler.
- Butter
- Adds richness and moisture, coating the fish and carrying the herbs.
- Parsley
- Contributes fresh, green aroma and a clean herbal flavour to the butter.
- Spring onions
- Adds mild, sharp allium aroma that balances the richness of the butter.
The step that matters
Broiling the herrings in buttered paper. Broiling until done on one side and then turning requires attention, since oily fish overcooks quickly and can dry out. The buttered paper shields the surface so the flesh cooks gently while staying moist.
Flavor stand-ins for the onion
How well each one fits the dish's main ingredients (butter, parsley, pepper):
- Carrotbetter flavor fit
- Potatobetter flavor fit
- Capsicumbetter flavor fit
- Onionthe original
Fit is the average pairing score against butter, parsley, pepper. 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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