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Mock Terrapin

A liver dish made with calf's liver, mustard, lemon, cayenne, and eggs.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 10 ingredients
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Why it works: Lemon and pepper match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and cooks put them together in 27,047 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓

Mock Terrapin

Ingredients

Directions

Prepare the liver

  1. Season the calf's liver with coarse sea salt.

  2. Fry the liver in butter until brown.

  3. Cut the liver into small bits and dredge with flour.

Make the sauce and serve

  1. Add ½ pint of water, mixed mustard, lemon juice, cayenne pepper, and chopped hard-boiled eggs.

  2. Boil for 1-2 minutes and serve.

  3. You can use cold veal instead of liver.

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. Lemon + peppertop 3% of all pairs
    Smell alikestrong
    Cooked together27,047 recipes

    Shared aroma: trans-2-nonenal (cardboard, fatty).

  2. Mustard + peppertop 9% of all pairs
    Smell alikemoderate
    Cooked together15,430 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  3. Mustard + lemontop 11% of all pairs
    Smell alikestrong
    Cooked together3,816 recipes

    Shared aroma: eucalyptol (eucalyptus, herbal).

  4. Butter + flourtop 12% of all pairs
    Smell alikelow
    Cooked together124,287 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  5. Flour + mustardtop 13% of all pairs
    Smell alikemoderate
    Cooked together5,066 recipes

    Shared aroma: isobutyraldehyde (malty, green).

Butter and flour barely smell alike, yet cooks put them together in 124,287 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

Calf's liver
Forms the meaty body of the dish and browns in butter for savoury flavour.
Flour
Coats the liver pieces so the sauce thickens and clings to them.
Hard-boiled eggs
Add richness and body to the sauce as they are chopped through it.
Mixed mustard
Adds sharp, tangy flavour that cuts through the richness of the liver and eggs.
Lemon juice
Adds acidity that brightens the sauce and balances the fat.

The step that matters

Dredging the liver in flour. Flour must coat the pieces evenly so the liquid thickens into a smooth sauce rather than lumps. Dry or clumped flour leaves streaks and uneven thickening once the water is added.

Swap the mustard

How well each one fits the dish's main ingredients (liver, butter, flour, lemon, pepper, egg):

  1. Shallotfits better
  2. Asparagusfits better
  3. Chivefits better
  4. Mustardthe original

Fit is the average pairing score against liver, butter, flour, lemon, pepper, egg. 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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