Why it works: Pepper and lemon match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and cooks put them together in 27,047 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓
Roast Wild Duck
Ingredients
Directions
The book says “a hot oven”. The 400°F (200°C) in the steps is the modern equivalent, not the book's own figure.
Prepare
Cut the onion in half and place it inside the duck.
Let the duck sit with the onion for several hours.
Clean the duck as you would poultry and wipe it inside and out with a damp towel.
Tuck back the wings and truss the legs close to the body.
Rub the duck with salt, pepper, butter, and flour.
Roast and serve
Place the duck in a baking pan and add 1 cup of boiling water.
Roast in a 400°F (200°C) oven for 25 to 35 minutes, basting occasionally with butter.
Serve very hot with slices of lemon or currant jelly.
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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Pepper + lemontop 3% of all pairsSmell alikestrongCooked together27,047 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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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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Onion + buttertop 15% of all pairsSmell alikemoderateCooked together42,912 recipes
Shared aroma: decanal (soap, orange peel).
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Butter + lemontop 16% of all pairsSmell alikemoderateCooked together41,227 recipes
Shared aroma: 3-hexenal (apple, fruity).
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
- Wild duck
- Forms the main meat, which cooks through in the oven and is tender when roasted hot.
- Butter
- Adds fat that carries flavour and helps the skin brown as it roasts.
- Flour
- Dusted on the skin, it helps the surface brown and crisp during roasting.
- Onion
- Sits inside the cavity, where it gives off aromatic moisture and flavour into the meat.
The step that matters
Roast in a 400°F (200°C) oven for 25 to 35 minutes, basting occasionally with butter. Wild duck is lean and dries out quickly at high heat, so the cook must watch the time closely and baste to keep the meat moist. Wild duck is also often served rare to medium, so the cook should check doneness early rather than overcook it.
Swap the onion
How well each one fits the dish's main ingredients (pepper, butter, flour, lemon):
- Shallotfits better
- Arrowrootfits better
- Okrafits better
- Onionthe original
Fit is the average pairing score against pepper, butter, flour, lemon. 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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