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To Boil Ducks

A duck boiled slowly in a cloth, served with onion sauce made from butter and milk.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Butter and milk are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 81,283 recipes. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓

To Boil Ducks

Ingredients

Directions

Prepare

  1. Salt the duck for two days.

Cook and serve

  1. Boil the duck slowly in a cloth.

  2. Serve with onion sauce made by melting butter with milk instead of water.

Recipe from a historical cookbook (Internet Archive).

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.

  1. Butter + milktop 7% of all pairs
    Smell alikemoderate
    Cooked together81,283 recipes

    Shared aroma: (z)-4-heptenal (biscuit, cream).

  2. Sauce + buttertop 15% of all pairs
    Smell alikelow
    Cooked together15,338 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

  3. Onion + buttertop 15% of all pairs
    Smell alikemoderate
    Cooked together42,912 recipes

    Shared aroma: decanal (soap, orange peel).

  4. Onion + saucetop 19% of all pairs
    Smell alikelow
    Cooked together10,474 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

  5. Onion + milktop 20% of all pairs
    Smell alikemoderate
    Cooked together13,418 recipes

    Shared aroma: hexanal (green, grassy).

Sauce and butter barely smell alike, yet cooks put them together in 15,338 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

Fat duck
Provides the main meat and rich fat that carries flavour through the boil.
Coarse sea salt
Seasons the duck deeply over two days and draws out moisture to firm the meat.
Butter
Enriches the onion sauce with fat for a smooth, rich texture.
Milk
Replaces water in the sauce, adding creaminess and mild sweetness.

The step that matters

Boil the duck slowly in a cloth. Boiling too hard can toughen the meat and break up its fat. A gentle simmer cooks the duck evenly and keeps it tender and moist.

Swap the onion

How well each one fits the dish's main ingredients (sauce, butter, milk):

  1. Potatofits better
  2. Capsicumfits about as well
  3. Tomatofits about as well
  4. Onionthe original

Fit is the average pairing score against sauce, butter, milk. 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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