Why it works: Pepper and lemon match in chemistry and in kitchens. They rank in the top 2% of all ingredient pairs, and 27,039 recipes mention both. Both carry 2-nonenal, which smells fatty, green. The science ↓
The recipe
Ingredients
Contains: milk, fish (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Prepare
Preheat the oven to 300°F (150°C).
Lay the cod slices in a well-buttered paper bag.
Season the fish with coarse sea salt and black pepper.
Bake
Place the mushrooms and sliced tomatoes on top of the fish.
Add the chopped shallot and dot with butter.
Squeeze lemon juice over the top.
Seal the bag and cook for 15 minutes.
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 + lemontop 2% of all pairsAroma overlapstrongMentioned together27,039 recipes
Shared aroma: 2-nonenal (fatty, green).
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Mushroom + buttertop 3% of all pairsAroma overlapstrongMentioned together12,516 recipes
Shared aroma: trans-2-decenal (waxy, orange).
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Mushroom + shallottop 3% of all pairsAroma overlapmoderateMentioned together1,960 recipes
Shared aroma: 2-octenal (fatty, green).
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Mushroom + tomatotop 4% of all pairsAroma overlapstrongMentioned together2,718 recipes
Shared aroma: trans,trans-2,4-nonadienal (fatty, green).
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Pepper + tomatotop 4% of all pairsAroma overlapstrongMentioned together17,913 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Cod
- Forms the main body of the dish, cooking gently in its own steam and juices.
- Mushrooms
- Release moisture as they cook, adding savory depth to the juices in the bag.
- Tomatoes
- Break down while cooking, adding moisture and gentle acidity to the sauce.
- Shallot
- Contributes a mild, sweet onion-like aroma that mellows during cooking.
- Butter
- Adds richness and moisture, helping the fish stay tender as it cooks.
The step that matters
Seal the bag and cook for 15 minutes. The sealed bag traps steam so the fish cooks gently in its own juices. If the seal leaks, steam escapes and the cod can dry out or cook unevenly.
Flavor stand-ins for the shallot
How well each one fits the dish's main ingredients (pepper, mushroom, tomato, butter, lemon):
- Capsicumbetter flavor fit
- Potatobetter flavor fit
- Asparagusbetter flavor fit
- Shallotthe original
Fit is the average pairing score against pepper, mushroom, tomato, butter, lemon. 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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