Why it works: Ketchup and sauce match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and 1,099 recipes mention both. Both carry ethanol, which smells alcoholic, ethereal. The science ↓
The recipe
Ingredients
Contains: milk, wheat, soy, fish (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Prepare the cod
Place cod sounds in boiling water until nearly cold.
Rub with coarse sea salt and remove the black skin.
Boil in hot water, then drain and dust with flour.
Rub with butter and season with white pepper and coarse sea salt.
Broil and finish
Broil until cooked through.
In a small pan, heat melted butter with ketchup, soy sauce, and cayenne pepper, then pour over the broiled cod sounds.
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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Ketchup + saucetop 1% of all pairsAroma overlapstrongMentioned together1,099 recipes
Shared aroma: ethanol (alcoholic, ethereal).
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Flour + buttertop 6% of all pairsAroma overlaplowMentioned together122,858 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Butter + saucetop 8% of all pairsAroma overlaplowMentioned together15,317 recipes
Shared aroma: ethanol (alcoholic, ethereal).
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Flour + ketchuptop 8% of all pairsAroma overlapstrongMentioned together2,426 recipes
Shared aroma: ethanol (alcoholic, ethereal).
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White pepper + peppertop 8% of all pairsAroma overlapmoderateMentioned together1,478 recipes
Shared aroma: piperonal (bitter, coconut).
Flour and butter 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
- Cod sounds
- The main protein; its firm, flaky flesh cooks through under the broiler.
- Flour
- Dusting forms a thin coating that helps the surface brown and hold the sauce.
- Butter
- Adds richness and moisture, and carries flavor into the sauce.
- Ketchup
- Adds sweetness and acidity to the glaze poured over the fish.
- Soy sauce
- Adds savory depth and salty umami to the sauce.
The step that matters
Broil until cooked through. Broiling is fast and intense, so the fish can dry out or char before the centre is done. Watch closely and check that the flesh flakes easily before pouring the sauce over it.
Flavor stand-ins for the white pepper
How well each one fits the dish's main ingredients (flour, butter, ketchup, sauce, pepper):
- Parsleybetter flavor fit
- Capersbetter flavor fit
- Celerybetter flavor fit
- White pepperthe original
Fit is the average pairing score against flour, butter, ketchup, sauce, 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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