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To Dress a Cod's Head and Shoulders

A method of preparing a cod's head and shoulders with salt, vinegar, butter, and garnishes.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 13 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 cod head

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

  2. Rub the head with a little coarse sea salt and place it on a fish plate.

Poach the fish

  1. In a pot, combine water with a handful of coarse sea salt and ½ cup vinegar, then add the fish.

  2. Boil gently for 30 minutes, or 45 minutes if large.

  3. Carefully remove the fish, strip off the skin, and place it before a brisk fire.

Brown and serve

  1. Dredge the fish with flour and baste it well with butter.

  2. When froth begins to rise, sprinkle fine white bread crumbs over it.

  3. Continue basting until it turns a fine light brown.

  4. Serve garnished with lemon slices, scraped horseradish, barberries, small fried fish, or fried oysters.

  5. Slice the roe and liver and place them on top, adding lumps of lobster from the sauce.

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's head
Forms the main body of the dish and provides the flaky, savoury flesh.
Butter
Carries heat and encourages even browning while adding richness to the crust.
Flour
Dries the skin surface so it crisps and browns when basted.
Fine white bread crumbs
Form a light, golden crust that adds a crisp texture over the fish.
Vinegar
Adds acidity to the poaching liquid, brightening the flavour of the fish.
Roe and liver from the cod
Add richness and a creamy texture to the finished dish.

The step that matters

Basting until light brown. Butter browns quickly at high heat, so the crumb crust can scorch before it turns a fine light brown. Steady basting and watching the colour keeps the surface golden while the fish stays moist underneath.

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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