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Dessert

Boiled Sponge Cake

A sponge cake made by boiling sugar and water, then mixing with eggs, flour, and lemon.

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 ↓

Boiled Sponge Cake

Oven, in the book's wordsA moderately quick oven

Ingredients

Directions

Make the syrup and eggs

  1. Boil sugar and water to syrup until it spins.

  2. Beat eggs separately, then together.

Combine and bake

  1. Pour hot syrup drop by drop into the eggs while beating until cool.

  2. Add sifted flour and lemon juice and rind, mixing well.

  3. Bake in a shallow pan lined with paper.

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 + lemontop 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
Beaten eggs trap air that lifts the cake and gives it its airy structure.
Sugar
Sugar boiled into syrup sweetens the cake and keeps its crumb tender.
Flour
Flour provides the structure that sets as the cake bakes and holds its shape.
Lemon
Lemon juice and rind add acidity and fresh aroma to the cake.

The step that matters

Pouring the hot syrup into the eggs. Adding the syrup slowly while beating warms the eggs gradually so they do not scramble. Continuous beating keeps the air bubbles that give the sponge its rise.

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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