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To Boil a Cod's Head and Shoulders

A boiled cod head and shoulders seasoned with salt, vinegar, and horseradish.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 ingredients
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Why it works: Vinegar and horseradish are a kitchen classic. They rank in the top 6% of all ingredient pairs, and 2,588 recipes mention both. Both carry isobutyraldehyde, which smells malty, green. The science ↓

The recipe

Ingredients

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

Directions

Poach the fish

  1. Fill a pot with water and add salt, vinegar, and horseradish.

  2. Bring the water to a boil.

  3. Carefully place the cod's head and shoulders into the boiling water.

  4. Boil until cooked through, ensuring the fish is not overcooked.

Serve

  1. Remove the fish and place it on a serving dish.

  2. Cover with a clean cloth to keep warm until serving.

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. Vinegar + horseradishtop 6% of all pairs
    Aroma overlaplow
    Mentioned together2,588 recipes

    Shared aroma: isobutyraldehyde (malty, 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
The main protein; its flesh turns opaque and flakes as it cooks.
Vinegar
Adds acidity to the poaching water, brightening the flavor of the fish.
Horseradish
Adds a sharp, pungent aroma to the poaching water.

The step that matters

Boil until cooked through, not overcooked. Fish proteins tighten as they heat, and past the point of doneness they squeeze out moisture, becoming dry, tough and stringy. Stopping as soon as the flesh is opaque and flakes keeps it moist and tender.

“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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