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To Clarify Calf’s Feet Stock

A clarified calf's feet stock made by simmering stock with egg whites, sugar, and lemon juice.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 ingredients
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Why it works: Sugar and lemon are a kitchen classic. They rank in the top 18% of all ingredient pairs, and cooks put them together in 53,532 recipes. Both carry 2-nonenal, which smells fatty, green. The science ↓

To Clarify Calf’s Feet Stock

Ingredients

Directions

  1. Break up the stock and place it in a clean saucepan.

  2. Add the egg whites, sugar, and lemon juice.

  3. Heat over a gentle fire without stirring after the scum begins to form.

  4. Boil for five minutes.

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. Sugar + lemontop 18% of all pairs
    Smell alikelow
    Cooked together53,532 recipes

    Shared aroma: 2-nonenal (fatty, green).

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

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

  3. Egg + sugartop 21% of all pairs
    Smell alikemoderate
    Cooked together122,807 recipes

    Shared aroma: 2-nonenal (fatty, green).

Sugar and lemon barely smell alike, yet cooks put them together in 53,532 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 feet stock
Forms the liquid base that is clarified into a clear stock.
Egg whites
Coagulate as they heat, trapping impurities so they can be skimmed off clear.
Sugar
Adds sweetness and helps the egg whites bind and clarify the liquid.
Lemon juice
Adds acidity that helps the egg whites coagulate and brightens the flavour.

The step that matters

Heating without stirring. Once the scum begins to form, stirring breaks up the coagulating egg white raft and pushes particles back into the liquid. Heating gently lets the raft form and trap impurities, leaving the stock clear.

Swap the lemon

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

  1. Vanillafits better
  2. Raisinfits about as well
  3. Lemonthe original
  4. Datesfits less well

Fit is the average pairing score against egg, sugar. 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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