Why it works: Onion and potato are a kitchen classic. They rank in the top 3% of all ingredient pairs, and 9,023 recipes mention both. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Blanche Kammerer
Ingredients
Directions
Prepare
Boil potatoes, mash, season with salt, pepper, butter, and onion juice.
Stuff fish with the mashed mixture, sprinkle with salt and pepper.
Bake and serve
Place stuffed fish in a roasting pan with two tablespoons butter, tomatoes, and water; bake for fifty minutes.
Serve with gravy and garnish with sliced hard-boiled eggs.
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. See the original page.
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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Onion + potatotop 3% of all pairsAroma overlapmoderateMentioned together9,023 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Potato + tomatotop 5% of all pairsAroma overlapstrongMentioned together2,798 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Tomato + peppertop 7% of all pairsAroma overlapmoderateMentioned together17,923 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Onion + tomatotop 8% of all pairsAroma overlapmoderateMentioned together20,633 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Potato + peppertop 9% of all pairsAroma overlapmoderateMentioned together8,305 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
- Trout
- Forms the main body of the dish, cooking gently while stuffed.
- Potatoes
- Mashed into a filling that adds starch and body to the stuffing.
- Butter
- Adds richness and fat, carrying flavor and helping keep the fish moist.
- Tomatoes
- Release juices into the pan, adding moisture and acidity to the cooking liquid.
- Onion juice
- Adds a sharp aromatic flavor to the potato filling.
The step that matters
Baking the stuffed fish in the pan with butter, tomatoes, and water. Trout is lean and dries out easily in heat. The butter, tomato juices, and water in the pan create steam and moisture around the fish, helping it stay tender while the filling heats through.
Flavor stand-ins for the tomato
How well each one fits the dish's main ingredients (onion, butter, potato, pepper):
- Chivebetter flavor fit
- Capsicumbetter flavor fit
- Carrotabout as good a flavor fit
- Tomatothe original
Fit is the average pairing score against onion, butter, potato, 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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