Why it works: Onion and sage 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
The book gives no oven temperature. The 400°F (200°C) in the steps was added when the recipe was transcribed, as a starting point.
Prepare
Wash and dry the ducks carefully.
Make a stuffing with the chopped onion and sage, then insert it into the ducks and sew them up completely.
Roast and serve
Roast the ducks in a 400°F (200°C) oven for about 1 hour, basting frequently.
A few minutes before serving, dredge the ducks lightly with flour to make them froth and look plump.
Serve hot with brown gravy poured over the ducks, accompanied by 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.
-
Onion + sagetop 12% of all pairsSmell alikemoderateCooked together3,628 recipes
Shared aroma: coumarin (sweet, hay).
-
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
- Dredged on the surface, it helps the skin froth and brown for a plumper look.
- Fresh sage
- Adds a savory, aromatic flavor to the stuffing inside the ducks.
- Onion
- Flavors the stuffing and adds aroma as the duck cooks.
The step that matters
Dredging the ducks with flour. Flour should be added only a few minutes before serving, since it needs dry heat to froth and brown; adding it too early can make it pasty or burn before the skin crisps.
Swap the peas
The recipe marks peas as optional. How well each one fits the dish's main ingredients (onion, sage, flour, currant):
- Chestnutfits better
- Beansfits better
- Almondfits better
- Peasthe original
Fit is the average pairing score against onion, sage, 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.
More roast duck recipes
You might also like
The free Flavor Lab newsletter: one surprising pairing a week and the molecular reason it works, in 60 seconds. No spam, unsubscribe anytime.
Prefer an account? Create a free account to save pairings and unlock the full chemistry.
Green Peas229 recipes
Green Peas Soup35 recipes
Tomato Soup526 recipes
Brown Bread461 recipes