Why it works: Flour and sugar 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 gives no oven temperature. The 350°F (175°C) in the steps was added when the recipe was transcribed, as a starting point.
Prepare
Preheat the oven to 350°F (175°C).
Beat the egg whites until stiff.
Make the batter
In a separate bowl, beat the egg yolks with the sugar until well combined.
Mix in the boiling water and flour until smooth.
Gently fold in the beaten egg whites.
Bake
Pour the batter into a baking pan and bake for 45 minutes on the lower shelf.
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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Flour + sugartop 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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Egg + sugartop 21% of all pairsSmell alikemoderateCooked together122,807 recipes
Shared aroma: 2-nonenal (fatty, green).
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 cake its light, airy structure.
- Flour
- Forms the gluten network that gives the baked cake its set structure.
- Sugar
- Sweetens the batter and helps the yolks blend into a stable, smooth mixture.
- Boiling water
- Adds moisture and loosens the batter so it bakes evenly and stays tender.
The step that matters
Gently fold in the beaten egg whites. Whipped egg whites hold trapped air that gives the cake its rise. Stirring vigorously or overmixing deflates them, leaving a dense, flat sponge.
“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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