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 ↓
Chocolate Icing
Ingredients
Directions
Boil the cocoa and water together until thick.
Stir in the icing sugar and vanilla extract.
Work the mixture until smooth, then it is ready for use.
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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Cocoa powder + vanillatop 10% of all pairsSmell alikemoderateCooked together2,189 recipes
Shared aroma: sotolon (curry, maple).
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Sugar + cocoa powdertop 14% of all pairsSmell alikemoderateCooked together2,920 recipes
Shared aroma: guaiacol (smoky, sweet).
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
- Icing sugar
- Adds sweetness and bulk, giving the icing its body as it is stirred into the mixture.
- Cocoa powder
- Gives the icing its chocolate flavour and dark colour, and thickens as it heats with the water.
The step that matters
Boil the cocoa and water until thick. Cocoa starch swells and thickens as it heats in liquid, so the mixture should reach a thick texture before the sugar is added. Too little heat leaves the icing thin, and it will stiffen as it cools.
“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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