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Dessert

Philadelphia Sponge Cake

A light sponge cake flavored with lemon rind and juice, made with beaten eggs and sugar syrup.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Sugar and flour are a kitchen classic. They rank in the top 15% of all ingredient pairs, and cooks put them together in 92,116 recipes. Both carry phenylacetaldehyde, which smells hawthorne, honey. The science ↓

Philadelphia Sponge Cake

Oven, in the book's wordsA quick oven

Ingredients

Directions

The book says “a quick oven”. The 400°F (200°C) in the steps is the modern equivalent, not the book's own figure.

Prepare

  1. Prepare baking pans.

  2. Pour ½ cup boiling water over ¾ pound sugar in a bowl; stir, cover, and let stand.

Make the batter

  1. Beat yolks of 6 eggs and add grated lemon rind.

  2. Froth egg whites and pour yolks on top; beat thoroughly.

  3. Add the syrup and beat for 10 minutes until thick.

  4. Sift in ½ pound flour and mix gently with a knife.

  5. Add juice of ½ lemon, pour into pans, and bake at 400°F (200°C) for 20 to 30 minutes.

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

    Shared aroma: phenylacetaldehyde (hawthorne, honey).

  2. Egg + flourtop 15% of all pairs
    Smell alikelow
    Cooked together106,462 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  3. Lemon + flourtop 17% of all pairs
    Smell alikemoderate
    Cooked together30,404 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  4. Sugar + lemontop 18% of all pairs
    Smell alikelow
    Cooked together53,532 recipes

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

  5. Egg + lemontop 19% of all pairs
    Smell alikelow
    Cooked together44,316 recipes

    Shared aroma: (e,e)-2,4-decadienal (fatty, deep fried).

Egg and flour barely smell alike, yet cooks put them together in 106,462 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 and yolks trap air and build the cake's light, airy structure.
Sugar
Sweetens the cake and, dissolved into syrup, helps the batter stay thick and tender.
Flour
Provides the set structure that holds the risen batter together as it bakes.
Lemon juice
Adds acidity and a bright flavour that balances the sweetness.

The step that matters

Beat the egg whites and yolks thoroughly. Air beaten into the eggs is what makes the sponge rise and stay light. Under-beaten batter bakes dense, while over-folding the flour after that deflates it and makes the cake heavy.

Swap the lemon

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

  1. Raisinfits better
  2. Vanillafits better
  3. Lemonthe original
  4. Figfits about as well

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