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To Make Sauce for the Cod’s Head

A sauce made from lobster, butter, lemon pickle, walnut ketchup, horseradish, and spices.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 10 ingredients
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Why it works: Ketchup and horseradish work together. They rank in the top 5% of all ingredient pairs, and 223 recipes mention both. Both carry ethanol, which smells alcoholic, ethereal. The science ↓

The recipe

Ingredients

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

Directions

Prepare the lobster

  1. Stick a skewer in the vent of the lobster's tail to keep water out.

  2. Boil water with a handful of coarse sea salt; add the lobster and boil for 30 minutes.

Make the sauce

  1. Remove any spawn from the lobster, pound them finely, and mix with melted butter.

  2. Add the lobster meat, lemon pickle, walnut ketchup, lemon slice, horseradish slices, ground mace, salt, and cayenne to the butter.

  3. Boil for 1 minute, then remove the horseradish and lemon slices.

  4. Serve the sauce in a sauceboat.

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. Ketchup + horseradishtop 5% of all pairs
    Aroma overlapmoderate
    Mentioned together223 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

  2. Meat + walnuttop 5% of all pairs
    Aroma overlapstrong
    Mentioned together1,034 recipes

    Shared aroma: 2,3,5-trimethylpyrazine (cocoa, roasted).

  3. Lobster + meattop 6% of all pairs
    Aroma overlaplow
    Mentioned together909 recipes
  4. Lobster + ketchuptop 6% of all pairs
    Aroma overlapmoderate
    Mentioned together48 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

  5. Butter + walnuttop 7% of all pairs
    Aroma overlapstrong
    Mentioned together6,819 recipes

    Shared aroma: eucalyptol (eucalyptus, herbal).

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

What each ingredient does

Lobster
Provides the main meat and rich, sweet flavour of the sauce.
Melted butter
Adds richness and a smooth, fat-based texture to the sauce.
Lobster spawn
Pounded and mixed into the butter, it thickens the sauce and deepens its flavour.
Lemon pickle
Adds sharp, tangy acidity that cuts through the rich butter.
Walnut ketchup
Contributes a savoury, deeply aromatic flavour to the sauce.

The step that matters

Pounding the spawn into the butter. Spawn must be pounded finely so it blends evenly into the melted butter. Coarse pieces stay gritty, while fine pieces give the sauce a smooth, uniform texture.

Flavor stand-ins for the lemon

How well each one fits the dish's main ingredients (lobster, butter, meat, walnut, ketchup, horseradish, mace):

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

Fit is the average pairing score against lobster, butter, meat, walnut, ketchup, horseradish, mace. 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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