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Dessert

Lemon Sponge

A lemon-flavored sponge with a custard topping, set in cups and chilled.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 11 ingredients
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Why it works: Milk and vanilla are a kitchen classic. They rank in the top 5% of all ingredient pairs, and cooks put them together in 19,187 recipes. Both carry ethyl caproate, which smells fruity, apple peel. The science ↓

Lemon Sponge

Ingredients

Directions

Make the sponge

  1. Soak the gelatine in the cold water for 10 minutes.

  2. Dissolve the gelatine over heat.

  3. Add lemon juice, hot water, and sugar to the dissolved gelatine.

  4. Boil the mixture for 2-3 minutes.

  5. Pour the mixture into a dish and let it cool until it begins to set.

  6. Add the beaten egg whites to the cooled mixture.

  7. Whisk the mixture for 10 minutes until it has a sponge-like consistency.

  8. Wet the inside of cups with egg white.

  9. Pour the sponge mixture into the cups.

  10. Refrigerate the cups.

Make the custard

  1. For the custard, boil the egg yolks, cornstarch, sugar, milk, and vanilla until thick.

Serve

  1. Serve the custard cold over the sponge after it has set for 24 hours.

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. Milk + vanillatop 5% of all pairs
    Smell alikemoderate
    Cooked together19,187 recipes

    Shared aroma: ethyl caproate (fruity, apple peel).

  2. Sugar + vanillatop 8% of all pairs
    Smell alikelow
    Cooked together35,032 recipes

    Shared aroma: beta-damascenone (apple, rose).

  3. Lemon + vanillatop 15% of all pairs
    Smell alikemoderate
    Cooked together5,961 recipes

    Shared aroma: eucalyptol (eucalyptus, herbal).

  4. Lemon + milktop 15% of all pairs
    Smell alikemoderate
    Cooked together19,053 recipes

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

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

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

Sugar and vanilla barely smell alike, yet cooks put them together in 35,032 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

Gelatine
Sets the liquid mixture into a light, wobbly structure as it cools.
Egg whites
Whipped into the mixture to create the airy, sponge-like texture.
Egg yolks
Thicken the custard as they cook, giving it body and richness.
Cornstarch
Thickens the custard by swelling and setting when heated with the liquid.
Lemon juice
Adds acidity and bright lemon flavour to the sponge.

The step that matters

Whisk the mixture until sponge-like. The gelatine must be cooled until it just begins to set before the egg whites are added. If it is too warm, the whites deflate; if it is too firm, the mixture will not whip into an airy sponge.

Swap the lemon

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

  1. Figfits better
  2. Peachfits better
  3. Blueberryfits better
  4. Lemonthe original

Fit is the average pairing score against sugar, egg, milk, vanilla. 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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