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Dessert

Lemon Sponge

A lemon gelatin dessert made with water, isinglass, lemon rind, sugar, lemon juice, and egg white.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Lemon and sugar 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 ↓

Lemon Sponge

Ingredients

Directions

Make the base

  1. In a pot, combine 1 pint of water, 1 ounce of isinglass, and the rind of 1 lemon.

  2. Add ½ pound of lump sugar and simmer for 30 minutes.

  3. Strain the mixture through a fine sieve and let it cool slightly.

Finish and whisk

  1. Once nearly cold, add the juice of 3 lemons and 1 egg white.

  2. Whisk until the mixture is white and thick.

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

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

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

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

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

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

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
Gelatin-like protein that sets the liquid into a light, wobbly structure as it cools.
Egg white
Whisked into the cooled mixture to trap air, making it thick, white and foamy.
Lump sugar
Sweetens the dish and helps balance the sharpness of the lemon juice.
Lemon juice
Provides sharp acidity and bright lemon flavour that cuts the sweetness.

The step that matters

Add the juice and egg white only once the mixture is nearly cold. If the liquid is still hot, the egg white can cook and scramble rather than whisk smoothly, and the isinglass will not set properly once cooled. Waiting until nearly cold lets the whisked foam hold its volume and the mixture thicken evenly.

Swap the lemon

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

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

Fit is the average pairing score against sugar, 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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