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Dessert

Lemon Sponge Cake

A sponge cake flavored with lemon rind, filled with custard, and frosted with powdered sugar.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 11 ingredients
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Why it works: Flour and milk are a kitchen classic. They rank in the top 14% of all ingredient pairs, and cooks put them together in 78,219 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓

Lemon Sponge Cake

Ingredients

Directions

The book gives no oven temperature. The 400°F (200°C) in the steps was added when the recipe was transcribed, as a starting point.

Make the cake

  1. Preheat the oven to 400°F (200°C).

  2. Separate the egg whites from the yolks.

  3. Beat the egg whites to a stiff froth.

  4. Beat the yolks and combine them with the egg whites.

  5. Add the sugar, then the flour and baking powder.

  6. Stir in the cold water and grated lemon rind for three minutes.

  7. Pour the batter into a flat tin or small dripping pan and bake quickly.

Make the custard

  1. Heat the milk over a kettle of boiling water for the custard.

  2. Beat the 2 eggs with the sugar and a pinch of salt in a bowl.

  3. When the milk is hot, stir it into the egg mixture.

Assemble and finish

  1. Fill a split loaf of the cake with the custard.

  2. Thicken lemon juice with powdered sugar to frost the top.

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

    Shared aroma: isobutyraldehyde (malty, green).

  2. Sugar + flourtop 15% of all pairs
    Smell alikemoderate
    Cooked together92,116 recipes

    Shared aroma: phenylacetaldehyde (hawthorne, honey).

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

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

  4. Flour + eggtop 15% of all pairs
    Smell alikelow
    Cooked together106,462 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  5. Flour + lemontop 17% of all pairs
    Smell alikemoderate
    Cooked together30,404 recipes

    Shared aroma: isobutyraldehyde (malty, green).

Flour and milk barely smell alike, yet cooks put them together in 78,219 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
Whipped whites give the sponge its light structure, and the yolks add richness and colour.
Flour
Provides the structure that holds the sponge's airy foam once baked.
Baking powder
Releases gas in the batter, helping the cake rise and become lighter.
Sugar
Sweetens the cake and helps stabilise the beaten egg foam.
Milk
Forms the liquid base of the custard, adding moisture and a soft, set texture.

The step that matters

Beat the egg whites to a stiff froth. The whites must be beaten until stiff, since their trapped air is what lifts the sponge. Under-beaten or greasy whites collapse and yield a dense cake.

Swap the lemon

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

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

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