Why it works: Sauce and ketchup match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 1,099 recipes. Both carry ethanol, which smells alcoholic, ethereal. The science ↓
Dressed Ducks, or Geese Hashed
Ingredients
Directions
Make the sauce
In a stew-pan, melt the butter and add the diced onion. Fry until soft but not browned.
Add enough boiling water to create a sauce and thicken with flour.
Add the duck pieces to the sauce to warm them, ensuring it does not boil.
Season with pepper, salt, and ketchup.
Serve
Serve the duck on a bed of sippets of fried or toasted bread.
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 their aromas overlap, and how often cooks already put them together.
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Sauce + ketchuptop 1% of all pairsSmell alikestrongCooked together1,099 recipes
Shared aroma: ethanol (alcoholic, ethereal).
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Butter + breadtop 7% of all pairsSmell alikemoderateCooked together27,232 recipes
Shared aroma: delta-decalactone (sweet, creamy).
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Onion + peppertop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + ketchuptop 13% of all pairsSmell alikemoderateCooked together2,435 recipes
Shared aroma: ethanol (alcoholic, ethereal).
Butter and flour barely smell alike, yet cooks put them together in 124,287 recipes: they 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
- Cooked duck
- Forms the main body of the dish and is warmed gently in the sauce.
- Flour
- Thickens the boiling water into a smooth sauce that coats the duck.
- Butter
- Fat that softens the onion and carries its flavour into the sauce.
- Onion
- Softened in butter to add sweetness and savoury depth to the sauce.
The step that matters
Warm the duck without boiling. Boiling a sauce containing cooked meat toughens the proteins and can cause the flour-thickened sauce to break or become grainy. Gentle heat keeps the duck tender and the sauce smooth.
Swap the onion
How well each one fits the dish's main ingredients (butter, sauce, flour, pepper, ketchup, bread):
- Shallotfits better
- Capsicumfits better
- Horseradishfits better
- Onionthe original
Fit is the average pairing score against butter, sauce, flour, pepper, ketchup, bread. Candidates are from the same food group and used in at least 100 recipes.
“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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