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 ↓
To Hash Ducks
Ingredients
Directions
Cut the cold duck into joints.
Warm the duck in gravy without boiling.
Add port wine, made mustard, butter, and flour.
Stir gently and serve warm.
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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Mustard + flourtop 13% of all pairsSmell alikemoderateCooked together5,066 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Port wine + buttertop 13% of all pairsSmell alikemoderateCooked together1,499 recipes
Shared aroma: ethyl octanoate (fruity, wine).
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Port wine + mustardtop 18% of all pairsSmell alikemoderateCooked together314 recipes
Shared aroma: guaiacol (smoky, sweet).
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Port wine + flourtop 21% of all pairsSmell alikelowCooked together1,167 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
- Duck
- Provides the main protein and meaty bulk of the hash.
- Gravy
- Carries moisture and flavor, keeping the duck tender as it warms.
- Port wine
- Adds sweetness and depth to the sauce while thickening it slightly.
- Made mustard
- Adds sharp acidity that balances the richness of the duck and butter.
- Butter
- Adds fat for richness and a silky mouthfeel in the sauce.
- Flour
- Thickens the sauce so it clings to the duck pieces.
The step that matters
Warm the duck in gravy without boiling. Boiling toughens the proteins in the duck and can cause the sauce to break or thicken unevenly. Gentle heat keeps the meat tender and the gravy smooth.
Swap the mustard
How well each one fits the dish's main ingredients (port wine, butter, flour):
- Shallotfits better
- Leekfits better
- Arrowrootfits better
- Mustardthe original
Fit is the average pairing score against port wine, butter, flour. 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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