Why it works: Sugar and lemon are a kitchen classic. They rank in the top 18% of all ingredient pairs, and cooks put them together in 53,532 recipes. Both carry 2-nonenal, which smells fatty, green. The science ↓
Icing
Ingredients
Directions
Break the egg whites into a clean, cool bowl.
Add a small handful of sugar and begin whipping with a beater.
Gradually add more sugar at intervals until all is used.
Beat continuously until the icing is smooth, fine, and firm, about 30 minutes.
If not stiff enough, add more sugar.
If using lemon juice, account for the extra liquid in your sugar measurement.
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 + 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).
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Egg + sugartop 21% of all pairsSmell alikemoderateCooked together122,807 recipes
Shared aroma: 2-nonenal (fatty, green).
Sugar and lemon barely smell alike, yet cooks put them together in 53,532 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
- Egg whites
- Whipped into a foam that gives the icing its light structure and firm body.
- Powdered white sugar
- Stiffens the whipped whites and sweetens the icing, setting it firm as it is added.
The step that matters
Beat until smooth, fine, and firm. Whipping the egg whites with sugar builds a stable foam. Under-beating leaves a soft, grainy icing that will not hold its shape, while over-adding sugar makes it stiff and brittle. Beat steadily and add sugar gradually to reach a firm, spreadable texture.
Swap the lemon
The recipe marks lemon as optional. How well each one fits the dish's main ingredients (egg, sugar):
- Vanillafits better
- Raisinfits about as well
- Lemonthe original
- Datesfits less well
Fit is the average pairing score against egg, sugar. 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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