Why it works: Sage and onion are a kitchen classic. They rank in the top 12% of all ingredient pairs, and cooks put them together in 3,628 recipes. Both carry coumarin, which smells sweet, hay. The science ↓
Roast Ducks
Ingredients
Directions
Prepare
Wash and dry the ducks carefully.
Make a stuffing with sage and onion.
Insert the stuffing into the ducks.
Sew the ducks up completely.
Roast and serve
Roast the ducks for about 1 hour, basting them well.
Lightly dredge the ducks with flour a few minutes before serving to make them froth and look plump.
Serve hot with brown gravy poured over the ducks.
Accompany with currant jelly and green peas if in season.
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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Sage + oniontop 12% of all pairsSmell alikemoderateCooked together3,628 recipes
Shared aroma: coumarin (sweet, hay).
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Sage + flourtop 13% of all pairsSmell alikemoderateCooked together2,115 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Onion + peastop 13% of all pairsSmell alikemoderateCooked together5,460 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Sage + peastop 15% of all pairsSmell alikemoderateCooked together204 recipes
Shared aroma: 2-hexenal (green, leafy).
-
Onion + flourtop 17% of all pairsSmell alikemoderateCooked together32,460 recipes
Shared aroma: isobutyraldehyde (malty, green).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Ducks
- Provide the main meat, whose fat renders and bastes the bird as it roasts.
- Flour
- Dusted on the skin before serving, it froths and gives the duck a plumper look.
- Sage
- Adds a savoury, herbal aroma to the stuffing inside the duck.
- Onion
- Adds savoury sweetness and moisture to the stuffing as it cooks inside the bird.
The step that matters
Basting the ducks while they roast. Duck skin is fatty and can dry or brown unevenly; regular basting with the rendered fat keeps the meat moist and helps the skin colour evenly.
Swap the peas
The recipe marks peas as optional. How well each one fits the dish's main ingredients (sage, onion, flour, currant):
- Chestnutfits better
- Beansfits better
- Almondfits better
- Peasthe original
Fit is the average pairing score against sage, onion, flour, currant. 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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