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To Boil a Cod’s Head and Shoulders

A boiled cod head and shoulders served with lemon, horseradish, barberries, fried fish, and oysters.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 11 ingredients
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Why it works: Butter and bread match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and 27,145 recipes mention both. Both carry delta-decalactone, which smells sweet, creamy. The science ↓

The recipe

Ingredients

Contains: milk, wheat, fish, shellfish (auto-detected from the ingredients and method; we can miss things, so check labels)

Directions

Prepare the fish

  1. Remove the gills and blood from the cod's head and wash it thoroughly.

  2. Rub the head with a little coarse sea salt and alegar.

Boil

  1. In boiling water, add a handful of coarse sea salt and alegar, then gently add the fish.

  2. Boil gently for 30 minutes for a large fish, or 45 minutes for a larger one.

  3. Carefully remove the fish and strip off the skin.

Brown and serve

  1. Place the fish before a brisk fire, dredge with flour, and baste with butter.

  2. When froth begins to rise, sprinkle with fine white bread crumbs and continue basting.

  3. Once it is a nice golden brown, serve garnished with lemon slices, horseradish, barberries, small fried fish, and fresh oysters.

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 aroma chemistry they share, and how many recipes mention both.

  1. Butter + breadtop 3% of all pairs
    Aroma overlapstrong
    Mentioned together27,145 recipes

    Shared aroma: delta-decalactone (sweet, creamy).

  2. Fish + oystertop 3% of all pairs
    Aroma overlapstrong
    Mentioned together488 recipes

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

  3. Bread + fishtop 4% of all pairs
    Aroma overlapstrong
    Mentioned together1,661 recipes

    Shared aroma: 2-undecenal (sweet).

  4. Butter + fishtop 5% of all pairs
    Aroma overlapstrong
    Mentioned together4,432 recipes

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

  5. Bread + oystertop 5% of all pairs
    Aroma overlapmoderate
    Mentioned together2,544 recipes

    Shared aroma: 2-nonenal (fatty, green).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Cod head and shoulders
Forms the main body of the dish, cooked gently in acidified salted water to firm the flesh.
Butter
Carries heat and fat to the surface, encouraging browning and a rich flavour while basting.
Flour
Dusted on the surface, it helps form a dry layer that browns well under the fire.
Fine white bread crumbs
Sprinkled on during basting, they add a crisp golden crust on the surface.
Alegar
Acidic liquid in the poaching water and rub, adding sharpness and helping the flesh hold its shape.

The step that matters

Boil gently. A hard boil breaks the delicate fish apart and toughens the flesh. Gentle simmering cooks it evenly while keeping it moist and intact.

Flavor stand-ins for the lemon

How well each one fits the dish's main ingredients (vinegar, flour, butter, bread, horseradish, fish, oyster):

  1. Lemonthe original
  2. Appleabout as good a flavor fit
  3. Grapeabout as good a flavor fit
  4. Plumabout as good a flavor fit

Fit is the average pairing score against vinegar, flour, butter, bread, horseradish, fish, oyster. Candidates are from the same food group and used in at least 100 recipes. This compares flavor only: it does not check the job the ingredient does in the dish (bulk, moisture, acidity, structure).

“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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