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 ↓
Sponge-cake
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.
Make the syrup
Boil the sugar and water together until they form a thick syrup.
Let the syrup cool slightly.
Make the batter
Pour the cooled syrup into the well-whisked eggs.
Continue beating the mixture for a few minutes.
Grate the lemon rind.
Mix the carbonate of soda with the flour.
Stir the flour and lemon rind lightly into the egg mixture.
Add the lemon juice. Mix thoroughly.
Bake
Pour the batter into a buttered mold.
Bake in a preheated oven at 400°F (200°C) for just over 1 hour.
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.
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Sugar + flourtop 15% of all pairsSmell alikemoderateCooked together92,116 recipes
Shared aroma: phenylacetaldehyde (hawthorne, honey).
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Egg + flourtop 15% of all pairsSmell alikelowCooked together106,462 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Lemon + flourtop 17% of all pairsSmell alikemoderateCooked together30,404 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Sugar + lemontop 18% of all pairsSmell alikelowCooked together53,532 recipes
Shared aroma: 2-nonenal (fatty, green).
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Egg + lemontop 19% of all pairsSmell alikelowCooked 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
- Whisked to trap air, giving the sponge its light, airy structure.
- Flour
- Forms the cake's structure once heated and set.
- Sugar
- Sweetens the cake and, dissolved as syrup, adds moisture and tenderness.
- Carbonate of soda
- Reacts with the acidity in the batter to produce gas that helps the cake rise.
- Lemon
- Rind adds aroma and juice adds acidity and brightness to the batter.
The step that matters
Stir the flour in lightly. Overmixing once flour is added develops gluten and deflates the whisked eggs, producing a tough, dense cake instead of a light sponge.
Swap the lemon
How well each one fits the dish's main ingredients (sugar, egg, flour):
- Raisinfits better
- Vanillafits better
- Lemonthe original
- 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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