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 Roll
Ingredients
Directions
Make the batter
Beat the egg yolks and sugar together.
Slowly pour the boiling water over the yolk mixture.
Stir in the grated flour and then fold in the beaten egg whites.
Retain a little flour mixed with the Magic Baking Powder for the last step.
Bake and roll
Bake in thin layers.
While hot, spread with jelly or jam and roll up.
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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Flour + eggtop 15% of all pairsSmell alikelowCooked together106,462 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Sugar + eggtop 21% of all pairsSmell alikemoderateCooked together122,807 recipes
Shared aroma: 2-nonenal (fatty, green).
Flour and egg 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 whites trap air that lifts the sponge, while yolks add richness and structure.
- Flour
- Its starch sets during baking, giving the sponge its structure.
- Sugar
- Sweetens the batter and helps the beaten eggs hold their air.
- Magic baking powder
- Releases gas in the oven so the layers rise.
- Boiling water
- Moistens the flour and keeps the sponge tender.
The step that matters
Slowly pour the boiling water over the yolk mixture. Hot liquid can partly cook and curdle the egg yolks if added quickly. Pouring slowly while mixing spreads the heat evenly, keeping the batter smooth and fluid for a light 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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