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Mock Turtle Soup

A soup made with butter, flour, broth, calf's head, mushrooms, truffles, hard‑boiled eggs, and lemon.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 8 ingredients
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Why it works: Beef and mushroom are a kitchen classic. They rank in the top 4% of all ingredient pairs, and cooks put them together in 3,232 recipes. Both carry 2,4-nonadienal, which smells fatty, green. The science ↓

Mock Turtle Soup

Ingredients

Directions

Make the soup

  1. Melt the butter in a saucepan over medium heat.

  2. Stir in the flour and cook until it turns brown.

  3. Add the broth and bring to a boil for 5 minutes.

  4. Stir in the diced calf's head, mushrooms, and truffles, and boil for another 5 minutes.

Serve

  1. In a tureen, combine the diced hard-boiled eggs and lemon, then pour the soup over them.

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. Beef + mushroomtop 4% of all pairs
    Smell alikemoderate
    Cooked together3,232 recipes

    Shared aroma: 2,4-nonadienal (fatty, green).

  2. Mushroom + truffletop 4% of all pairs
    Smell alikemoderate
    Cooked together1,900 recipes

    Shared aroma: 2,4-nonadienal (fatty, green).

  3. Butter + mushroomtop 7% of all pairs
    Smell alikemoderate
    Cooked together12,525 recipes

    Shared aroma: trans-2-decenal (waxy, orange).

  4. Butter + truffletop 11% of all pairs
    Smell alikemoderate
    Cooked together2,209 recipes

    Shared aroma: nonanal (fat, citrus).

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

Flour
Thickens the broth and, when cooked until brown, adds color and a toasty flavor.
Butter
Carries the flour and adds richness to the soup base.
Calf's head
Provides the meaty body and texture that gives the soup its substance.
Hard-boiled eggs
Add soft, mild richness and texture to the finished soup.
Lemon
Adds acidity that brightens the rich broth.

The step that matters

Cooking the flour until brown. Flour must be cooked in the butter until it browns, which removes raw starch flavor and builds a nutty color. Stopping early leaves a pasty taste, while cooking too long can scorch it and make the soup bitter.

Swap the lemon

How well each one fits the dish's main ingredients (butter, flour, beef, mushroom, truffle, egg):

  1. Lemonthe original
  2. Coconutfits about as well
  3. Avocadofits about as well
  4. Pumpkinfits about as well

Fit is the average pairing score against butter, flour, beef, mushroom, truffle, 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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