Why it works: Onion and pepper are a kitchen classic. They rank in the top 11% of all ingredient pairs, and cooks put them together in 68,474 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Dressed Ducks, or Geese Hashed
Ingredients
Directions
Make the sauce
In a stew-pan, melt the butter and fry the diced onion without letting it color.
Add enough boiling water to make a sauce for the hash.
Thicken the sauce with flour.
Finish the hash
Add the duck pieces to the sauce to warm them without boiling.
Season with pepper, salt, and ketchup.
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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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).
-
Flour + ketchuptop 13% of all pairsSmell alikemoderateCooked together2,435 recipes
Shared aroma: ethanol (alcoholic, ethereal).
-
Onion + buttertop 15% of all pairsSmell alikemoderateCooked together42,912 recipes
Shared aroma: decanal (soap, orange peel).
-
Onion + flourtop 17% of all pairsSmell alikemoderateCooked together32,460 recipes
Shared aroma: isobutyraldehyde (malty, green).
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
- Onion
- Softens and adds savory sweetness as the base flavor of the sauce.
- Butter
- Fat that carries the onion's flavor and helps it cook gently without browning.
- Flour
- Thickens the sauce so it clings to the duck pieces.
- Cooked duck
- Provides the main meat and richness of the hash.
The step that matters
Warming the duck without boiling. Once the duck is in the sauce, boiling can toughen the meat and make it dry and stringy. Gentle heat warms it through while keeping it tender and juicy.
Swap the onion
How well each one fits the dish's main ingredients (butter, flour, pepper, ketchup):
- Capsicumfits better
- Shallotfits better
- Turnipfits better
- Onionthe original
Fit is the average pairing score against butter, flour, pepper, ketchup. 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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