Why it works: Egg and sugar are a kitchen classic. They rank in the top 21% of all ingredient pairs, and cooks put them together in 122,807 recipes. Both carry 2-nonenal, which smells fatty, green. The science ↓
Boiled Icing
Ingredients
Directions
Make the icing
Beat the egg whites until they begin to froth.
Slowly pour boiling sugar over the egg whites while beating constantly until perfectly white.
Flavor with rose water.
Add citric acid to whiten.
If the icing is too thin, place the bowl in a pan of boiling water and cook until thick, stirring constantly.
Finish the cake
Spread the hot icing on your cake using a hot knife dipped in hot water for a smooth finish.
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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Egg + sugartop 21% of all pairsSmell alikemoderateCooked together122,807 recipes
Shared aroma: 2-nonenal (fatty, green).
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Sugar + rosetop 25% of all pairsSmell alikelowCooked together3,584 recipes
Shared aroma: beta-damascenone (apple, rose).
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Egg + rosetop 28% of all pairsSmell alikelowCooked together2,840 recipes
Shared aroma: decanal (soap, orange peel).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Egg whites
- Whipped into a foam that gives the icing its light, airy structure.
- Powdered sugar
- Dissolved into boiling syrup that sets the foam and adds sweetness.
- Citric acid
- Acidity helps keep the egg white foam stable and the icing white.
The step that matters
Pouring the boiling sugar. Pour the boiling sugar slowly while beating constantly. The hot syrup gently cooks the egg whites into a stable, glossy foam. Pouring too fast or stopping to beat can leave the whites grainy, lumpy, or collapsed.
“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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