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Dessert

Lemon Sponge, or Moulded Lemon Cream

A chilled lemon custard set in a mold, made with cream, lemon rind, sugar, isinglass, and lemon juice.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Cream and sugar are a kitchen classic. They rank in the top 9% of all ingredient pairs, and cooks put them together in 43,450 recipes. Both carry 2,3-butanedione, which smells butter, sweet. The science ↓

Lemon Sponge, or Moulded Lemon Cream

Ingredients

Directions

Make the base

  1. Infuse the cream with the lemon rind until flavorful.

  2. Dissolve the isinglass in the mixture without boiling.

  3. Stir in the sugar until fully dissolved.

  4. Add another ½ cup of cream and strain the mixture into a bowl.

Set and unmold

  1. Once cold, gradually whisk in the lemon juice until thick.

  2. Pour into an oiled mold and dip the mold in hot water to release.

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. Cream + sugartop 9% of all pairs
    Smell alikemoderate
    Cooked together43,450 recipes

    Shared aroma: 2,3-butanedione (butter, sweet).

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

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

  3. Cream + lemontop 30% of all pairs
    Smell alikelow
    Cooked together15,640 recipes

    Shared aroma: acetic acid (sour, vinegar).

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

Cream
Provides richness and a smooth, creamy body to the set dessert.
Isinglass
Gelling agent that sets the cream into a firm, sliceable mold.
Sugar
Adds sweetness that balances the sharpness of the lemon juice.
Lemon juice
Adds acidity and bright lemon flavor that cuts through the rich cream.

The step that matters

Dissolve the isinglass without boiling. Isinglass is a collagen-based gelling agent, and boiling can weaken its setting power. Keeping the mixture below a boil lets the isinglass dissolve fully so the cream sets firmly when cold.

Swap the lemon

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

  1. Vanillafits better
  2. Strawberryfits better
  3. Raspberryfits better
  4. Lemonthe original

Fit is the average pairing score against cream, 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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