Why it works: Milk and vanilla are a kitchen classic. They rank in the top 5% of all ingredient pairs, and cooks put them together in 19,187 recipes. Both carry ethyl caproate, which smells fruity, apple peel. The science ↓
Chocolate Icing
Ingredients
Directions
Melt the baker's chocolate in a saucepan.
Add the sweet milk and stir until combined.
In a separate bowl, beat the egg and then add it to the chocolate mixture.
Gradually add the powdered sugar, stirring continuously.
Cook the mixture over medium heat until it thickens to the consistency of molasses.
Remove from heat and stir in the vanilla extract.
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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Milk + vanillatop 5% of all pairsSmell alikemoderateCooked together19,187 recipes
Shared aroma: ethyl caproate (fruity, apple peel).
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Chocolate + vanillatop 5% of all pairsSmell alikemoderateCooked together10,020 recipes
Shared aroma: sotolon (curry, maple).
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Sugar + vanillatop 8% of all pairsSmell alikelowCooked together35,032 recipes
Shared aroma: beta-damascenone (apple, rose).
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Chocolate + sugartop 13% of all pairsSmell alikemoderateCooked together15,404 recipes
Shared aroma: guaiacol (smoky, sweet).
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Chocolate + milktop 13% of all pairsSmell alikemoderateCooked together9,128 recipes
Shared aroma: gamma-nonanolactone (coconut, 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
- Baker's chocolate
- Provides the chocolate flavour and dark colour, and firms as the icing cools.
- Egg
- Adds richness and body, and helps bind the icing as it cooks.
- Powdered sugar
- Sweetens the icing and thickens it as it dissolves and cooks.
- Sweet milk
- Loosens the chocolate so it blends smoothly into a spreadable mixture.
The step that matters
Cook until it thickens to the consistency of molasses. Heating thickens the icing as the sugar dissolves and the egg sets slightly; stopping too early leaves it thin and runny, while overcooking can make it stiff once 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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