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 ↓
Frost or Icing for Cakes
Ingredients
Directions
Make the icing
Beat the egg whites until very light.
Gradually add the sugar while continuing to beat.
Mix in the lemon juice until the mixture is very light and white.
Finish the cake
Place the cake before the fire.
Pour the icing over the cake and smooth it over the top and sides with the back of a spoon.
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, airy structure.
- Sugar
- Dissolves into the whipped whites to sweeten and stiffen the icing for a smooth, glossy coat.
- Lemon juice
- Adds acidity that helps stabilise the whipped egg white foam and brightens the flavour.
The step that matters
Mix in the lemon juice until the mixture is very light and white. Sugar must be beaten in gradually so the foam stays stable. Beating until the mixture is very light and white builds enough air and body for the icing to spread smoothly without weeping or sinking into the cake.
Swap the lemon
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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