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Royal Sponge Cake

A sponge cake made with eggs, sugar, flour, and a sugar syrup, topped with jelly, frosting, and desiccated coconut.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 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 ↓

Royal Sponge Cake

Ingredients

Directions

Prepare

  1. Separate the egg whites and yolks.

  2. Beat the whites until very stiff.

Make the batter

  1. In a saucepan, boil the sugar with cold water until it thickens.

  2. Combine the egg whites and yolks, then pour in the hot syrup and beat until lukewarm.

  3. Sift in the flour and mix well.

Bake and assemble

  1. Bake in two layers.

  2. Once cooled, layer with jelly, frost the top, and sprinkle with desiccated coconut.

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. Flour + coconuttop 16% of all pairs
    Smell alikemoderate
    Cooked together3,315 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  4. Egg + sugartop 21% of all pairs
    Smell alikemoderate
    Cooked together122,807 recipes

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

  5. Sugar + coconuttop 22% of all pairs
    Smell alikelow
    Cooked together5,742 recipes

    Shared aroma: 1-penten-3-one (fish, pungent).

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 trap air, giving the sponge its lift and light, airy structure.
Sugar
Sweetens the cake and, boiled with water, forms a syrup that helps keep it moist.
Flour
Provides the starch and gluten network that sets the sponge's structure as it bakes.

The step that matters

Beat the whites until very stiff. Stiff egg whites hold the air that makes a sponge rise. Under-whipped or deflated whites produce a dense, flat cake, so they should be fully beaten before the syrup and flour are folded in.

Swap the coconut

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

  1. Raisinfits better
  2. Vanillafits better
  3. Lemonfits better
  4. Coconutthe original

Fit is the average pairing score against egg, sugar, 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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