Why it works: Butter and flour are a kitchen classic. They rank in the top 12% of all ingredient pairs, and cooks put them together in 124,287 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓
Roast Duck
Ingredients
Directions
Place ducks in boiling water for a few minutes to loosen the skin, then remove the skin completely.
Wash the ducks thoroughly inside and out, then wipe dry with a cloth.
Season the ducks inside and out with sage and onions.
Roast the ducks, basting frequently.
Make gravy by stewing the necks, livers, hearts, and gizzards in a small saucepan with butter and flour.
Skim the fat from the gravy and pour it over the roasted ducks.
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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Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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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).
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Onion + buttertop 15% of all pairsSmell alikemoderateCooked together42,912 recipes
Shared aroma: decanal (soap, orange peel).
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Sage + buttertop 17% of all pairsSmell alikemoderateCooked together3,312 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
Swap the onion
How well each one fits the dish's main ingredients (sage, butter, flour):
- Shallotfits better
- Sweet potatofits better
- Chivefits better
- Onionthe original
Fit is the average pairing score against sage, butter, flour. Candidates are from the same food group and used in at least 100 recipes.
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