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Dessert

Lemon Sponge

A lemon-flavored sponge cake with custard filling and lemon frosting.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 10 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

The book gives no oven temperature. The 350°F (175°C) in the steps was added when the recipe was transcribed, as a starting point.

Prepare the batter

  1. Preheat the oven to 350°F (175°C).

  2. In a large bowl, mix the sugar, flour, eggs, lemon juice, lemon rind, and baking powder until well combined.

Bake and frost

  1. Divide the batter into two thick, oblong layers and bake until golden.

  2. For the frosting, combine lemon juice with powdered sugar until thick.

  3. Frost the top of one layer, then prepare the custard.

Make the custard and assemble

  1. For the custard, heat the milk in a saucepan, whisk in the egg and corn starch, and sweeten with vanilla.

  2. Spread the custard on the frosted layer, then top with the second layer and frost it.

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. Corn + vanillatop 9% of all pairs
    Smell alikemoderate
    Cooked together1,943 recipes

    Shared aroma: ethyl cinnamate (sweet, balsamic).

  4. Milk + corntop 10% of all pairs
    Smell alikemoderate
    Cooked together6,955 recipes

    Shared aroma: hexanal (green, grassy).

  5. Flour + vanillatop 12% of all pairs
    Smell alikemoderate
    Cooked together19,241 recipes

    Shared aroma: isobutyraldehyde (malty, 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

Eggs
Provide structure and lift to the sponge as they set during baking.
Flour
Forms the cake's structure once it sets in the oven.
Granulated sugar
Sweetens the cake and helps it stay tender and browned.
Baking powder
Releases gas in the batter so the cake rises and becomes light.
Corn starch
Thickens the custard so it holds its shape when spread.

The step that matters

Heating the custard. Cornstarch thickens only when heated enough to gelatinize its starch, so the custard must be cooked until it visibly thickens. Undercooked custard stays runny and soaks into the layers.

Swap the lemon

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

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

Fit is the average pairing score against sugar, flour, egg, milk, corn, 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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