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Dessert

Lemon Sponge

A light lemon-flavored sponge cake with custard filling and lemon-sugar 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. The book gives no cooking times either; the times in the steps were added in transcription, so check for doneness rather than trusting the clock.

Prepare the cake

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

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

  3. Divide the batter into two greased oblong baking pans.

  4. Bake for 25-30 minutes or until a toothpick comes out clean.

Make the custard

  1. For the custard, heat the milk in a saucepan.

  2. Whisk together the egg, cornstarch, and a bit of the warm milk, then add back to the saucepan.

  3. Cook until thickened, sweeten, and flavor with vanilla.

Assemble and frost

  1. Once the cakes are cool, frost the top of one layer with lemon juice mixed with powdered sugar.

  2. Spread the custard on top of the frosted layer, then place the second layer on top and frost it as well.

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

    Shared aroma: isobutyraldehyde (malty, green).

  4. Flour + milktop 14% of all pairs
    Smell alikelow
    Cooked together78,219 recipes

    Shared aroma: isobutyraldehyde (malty, green).

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

    Shared aroma: eucalyptol (eucalyptus, herbal).

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 richness to the batter as it sets in the oven.
Flour
Forms the structure of the cake crumb as it bakes.
Granulated sugar
Sweetens the cake and helps give it a tender, moist crumb.
Baking powder
Releases gas in the batter so the cake rises and becomes light.
Milk
Adds moisture and body to the custard filling.
Cornstarch
Thickens the custard as it heats so it sets to a spreadable filling.

The step that matters

Cooking the custard until thickened. Starch thickens only when heated enough to swell and gelatinize, so stopping too early leaves a runny filling, while overcooking can scorch the milk or break the egg. Stir constantly over moderate heat.

Swap the lemon

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

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

Fit is the average pairing score against sugar, flour, 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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