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Soup

Plain Calf's Head Soup

A soup made from a cleaned calf's head, knuckle of veal, onion, sweet herbs, water, salt, pepper, hard‑boiled eggs, and lemon.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 9 ingredients
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Why it works: Pepper and lemon 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 ↓

Plain Calf's Head Soup

Ingredients

Directions

Make the broth

  1. Combine the calf's head and knuckle of veal in a large kettle.

  2. Place the onion and sweet herbs in a cloth and add to the kettle.

  3. Pour in 4 quarts of water and bring to a boil.

  4. Start boiling by 8 a.m. for a 1 p.m. dinner.

  5. Boil steadily and season with salt and pepper.

Finish and serve

  1. One hour before serving, strain the soup through a colander.

  2. Carefully pick out the meat, chop it finely, and return it to the soup.

  3. Boil the eggs hard, chop them finely, and slice the lemon thin.

  4. Add the eggs and lemon to the soup just before 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 their aromas overlap, and how often cooks already put them together.

  1. Pepper + lemontop 3% of all pairs
    Smell alikestrong
    Cooked together27,047 recipes

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

  2. Onion + peppertop 11% of all pairs
    Smell alikemoderate
    Cooked together68,474 recipes

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

  3. Veal + lemontop 17% of all pairs
    Smell alikelow
    Cooked together4,580 recipes

    Shared aroma: 3-hexenal (apple, fruity).

  4. Veal + oniontop 17% of all pairs
    Smell alikelow
    Cooked together6,841 recipes

    Shared aroma: 2,4-decadienal (seaweed).

  5. Egg + lemontop 19% of all pairs
    Smell alikelow
    Cooked together44,316 recipes

    Shared aroma: (e,e)-2,4-decadienal (fatty, deep fried).

Egg and lemon barely smell alike, yet cooks put them together in 44,316 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 head
Provides gelatin and rich meat that give the soup body and savoury flavour.
Knuckle of veal
Adds collagen from bone and connective tissue, giving the broth body and richness.
Hard-boiled eggs
Add firm, chopped texture and mild richness to the finished soup.
Lemon
Adds acidity that brightens the rich broth and balances its fattiness.

The step that matters

Boil steadily, not violently. A steady simmer extracts gelatin and flavour from the bones and head while keeping the broth clear. A hard rolling boil emulsifies fat into the liquid and makes it cloudy.

Swap the onion

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

  1. Capsicumfits better
  2. Asparagusfits better
  3. Spinachfits better
  4. Onionthe original

Fit is the average pairing score against veal, pepper, egg, lemon. 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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