Why it works: Sugar and vanilla are a kitchen classic. They rank in the top 8% of all ingredient pairs, and cooks put them together in 35,032 recipes. Both carry beta-damascenone, which smells apple, rose. The science ↓
Ice Ceeam Icing for White Caee
Ingredients
Directions
Make the syrup
Boil 2 cups of powdered sugar with enough water to make a thick syrup.
Remove from heat and add 3 teaspoons of vanilla extract.
Let it cool, then fold in the beaten egg whites and 2 teaspoons of citric acid.
Make the icing
In a separate bowl, combine 1 pound of powdered sugar with 1 tablespoon of cold water.
Add the lightly beaten egg whites to the sugar and water mixture.
Place the bowl in a vessel of boiling water and heat until the mixture becomes thin and clear.
Continue heating until it thickens, then remove from heat.
Stir until it cools and thickens enough to spread with a knife.
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 + vanillatop 8% of all pairsSmell alikelowCooked together35,032 recipes
Shared aroma: beta-damascenone (apple, rose).
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Sugar + eggtop 21% of all pairsSmell alikemoderateCooked together122,807 recipes
Shared aroma: 2-nonenal (fatty, green).
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Vanilla + eggtop 23% of all pairsSmell alikelowCooked together27,347 recipes
Shared aroma: 1-octen-3-ol (mushroom, earthy).
Sugar and vanilla barely smell alike, yet cooks put them together in 35,032 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 proteins that set on heating, giving the icing body and a light, airy structure.
- Powdered sugar
- Provides sweetness and, once dissolved into syrup, the bulk and firmness of the icing.
- Citric acid
- Adds acidity that brightens the sweetness and helps stabilize the egg white foam.
The step that matters
Heating the egg white and sugar mixture. Heating over boiling water must be done gently and until the mixture turns thin and clear, then thickens. Heating too little leaves the sugar grainy, while overheating can cause the egg whites to scramble or over-set, making the icing lumpy or stiff.
“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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