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Dessert

Lemon Isinglass, or Gelatine, Jelly

A clear lemon gelatin made with isinglass, sugar, lemon juice, sherry, and egg whites.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 9 ingredients
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Why it works: Lemon and sherry are a kitchen classic. They rank in the top 17% of all ingredient pairs, and cooks put them together in 3,273 recipes. Both carry 1-octen-3-ol, which smells mushroom, earthy. The science ↓

Lemon Isinglass, or Gelatine, Jelly

Ingredients

Directions

Prepare the lemon base

  1. Grate the yellow rind of the lemons into a bowl with the sugar.

  2. Pour the strained juice of the lemons over the sugar.

  3. In an enamelled saucepan, combine the lemon mixture, isinglass, water, and sherry.

Make and clarify the jelly

  1. Heat gently, stirring until the isinglass dissolves.

  2. Strain the mixture through a bag.

  3. If not transparent, mix in the whisked egg whites and crushed shells with cold water.

  4. Boil the jelly for 3 minutes without stirring.

  5. Let it settle for 5-6 minutes.

  6. Strain again.

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 + sherrytop 17% of all pairs
    Smell alikemoderate
    Cooked together3,273 recipes

    Shared aroma: 1-octen-3-ol (mushroom, earthy).

  2. Lemon + sugartop 18% of all pairs
    Smell alikelow
    Cooked together53,532 recipes

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

  3. Lemon + eggtop 19% of all pairs
    Smell alikelow
    Cooked together44,316 recipes

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

  4. Sugar + eggtop 21% of all pairs
    Smell alikemoderate
    Cooked together122,807 recipes

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

  5. Sugar + sherrytop 22% of all pairs
    Smell alikelow
    Cooked together4,141 recipes

    Shared aroma: guaiacol (smoky, sweet).

Lemon and sugar 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

Isinglass
Dissolves to set the liquid into a firm, tender jelly.
Sugar
Sweetens the jelly and balances the sharpness of the lemon juice.
Lemon juice
Provides the main acidity and lemon flavour of the jelly.
Egg whites
Coagulate and collect impurities, helping clarify the jelly to transparency.
Sherry
Adds aroma and a warm, mellow flavour to the lemon base.

The step that matters

Boil the jelly for 3 minutes without stirring. Stirring during the boil can break up the egg-white clarifying mass and cloud the jelly. Holding a steady boil also helps the egg whites coagulate and trap impurities, so the jelly sets clear.

Swap the lemon

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

  1. Vanillafits better
  2. Figfits better
  3. Pineapplefits better
  4. Lemonthe original

Fit is the average pairing score against sugar, sherry, 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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