Why it works: Tomato and haddock work together. They rank in the top 14% of all ingredient pairs, and 128 recipes mention both. Both carry ethanol, which smells alcoholic, ethereal. The science ↓
The recipe
Ingredients
Contains: milk, wheat, fish (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Make the sauce
Melt the butter in a saucepan.
Brown the flour in the melted butter.
Gradually add the cooked strained tomato and cook for 5 minutes.
Stir in the salt, pepper, and onion slice.
Cook the fish
Add the haddock and cook for 2 hours.
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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Tomato + haddocktop 14% of all pairsAroma overlaplowMentioned together128 recipes
Shared aroma: ethanol (alcoholic, ethereal).
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Tomato + peppertop 4% of all pairsAroma overlapstrongMentioned together17,913 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Tomato + oniontop 4% of all pairsAroma overlapstrongMentioned together20,622 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Butter + flourtop 6% of all pairsAroma overlaplowMentioned together122,858 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Pepper + oniontop 6% of all pairsAroma overlapmoderateMentioned together68,463 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Butter and flour share little aroma chemistry, yet 122,858 recipes mention both: they likely work on texture and structure more than aroma.
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Butter
- Carries the flour for browning and adds richness to the sauce.
- Flour
- Thickens the sauce as its starch swells in the hot butter and liquid.
- Tomato
- Provides the sauce's main body, moisture, and acidity.
- Haddock
- Is the main protein, cooked gently in the tomato sauce until it flakes.
The step that matters
Add the haddock and cook for 2 hours. Fish proteins set and toughen with prolonged heat, so the fish can turn dry and mushy if cooked much longer than needed. The stated time is long for fish, so check the doneness of the haddock as it cooks.
Flavor stand-ins for the onion
How well each one fits the dish's main ingredients (butter, flour, tomato, pepper, haddock):
- Potatobetter flavor fit
- Capsicumbetter flavor fit
- Carrotabout as good a flavor fit
- Onionthe original
Fit is the average pairing score against butter, flour, tomato, pepper, haddock. 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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