Why it works: Chocolate and vanilla are a kitchen classic. They rank in the top 5% of all ingredient pairs, and cooks put them together in 10,020 recipes. Both carry sotolon, which smells curry, maple. The science ↓
Cake Icing
Ingredients
Directions
Make the first icing
Sift the icing sugar into a bowl and make a well in the center.
Add the egg whites and lemon juice.
Mix with a wooden spoon until soft.
Use a knife dipped in water to spread two layers of icing on the cake.
Make and pour the syrup
Boil the loaf sugar and water together for 15-20 minutes until syrupy.
Stir the syrup until nearly cold.
Pour the syrup over the cake.
Decorate with chocolate
Once dry, decorate with the first icing using a piping bag.
Melt the chocolate in water; boil carefully.
Allow the chocolate icing to cool slightly.
Stir in the vanilla and icing sugar without boiling.
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.
-
Chocolate + vanillatop 5% of all pairsSmell alikemoderateCooked together10,020 recipes
Shared aroma: sotolon (curry, maple).
-
Sugar + vanillatop 8% of all pairsSmell alikelowCooked together35,032 recipes
Shared aroma: beta-damascenone (apple, rose).
-
Sugar + chocolatetop 13% of all pairsSmell alikemoderateCooked together15,404 recipes
Shared aroma: guaiacol (smoky, sweet).
-
Lemon + vanillatop 15% of all pairsSmell alikemoderateCooked together5,961 recipes
Shared aroma: eucalyptol (eucalyptus, herbal).
-
Sugar + lemontop 18% of all pairsSmell alikelowCooked together53,532 recipes
Shared aroma: 2-nonenal (fatty, green).
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
- Whisked into the icing to give it body and a soft, spreadable structure.
- Icing sugar
- Provides sweetness and bulk, forming the main body of the icing.
- Lemon juice
- Adds acidity that balances the sweetness and helps stabilise the egg whites.
- Loaf sugar syrup
- Sweetens and moistens the cake, and its sugar keeps the surface from drying out.
- Chocolate
- Adds fat and rich flavour, and firms up as the icing cools.
The step that matters
Melting and stirring the chocolate icing. Chocolate can seize, scorch or turn grainy if overheated or if any water gets into it. Keep the heat gentle and avoid boiling once the vanilla and icing sugar go in, so the icing stays smooth and glossy.
Swap the lemon
How well each one fits the dish's main ingredients (sugar, egg, chocolate, vanilla):
- Coconutfits better
- Figfits better
- Raspberryfits better
- Lemonthe original
Fit is the average pairing score against sugar, egg, chocolate, vanilla. 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.
More cake icing recipes
You might also like
Lemon Cake228 recipes
Chocolate Cream171 recipes
Lemon Ice147 recipes
Vanilla Ice Cream108 recipesThe free Flavor Lab newsletter: one surprising pairing a week and the molecular reason it works, in 60 seconds. No spam, unsubscribe anytime.
Prefer an account? Create a free account to save pairings and unlock the full chemistry.