Name: Chocolate Frosting for Layer Cake
Ingredients: 1 cup granulated sugar; ⅓ cup hot water; 1 egg white; 1 pinch cream of tartar; 2 heaping tablespoons grated chocolate; 2 tablespoons cream; ½ teaspoon butter; 1 teaspoon vanilla extract

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 ↓

Chocolate Frosting for Layer Cake

Ingredients

Directions

Make the syrup

Combine the sugar and hot water in a porcelain-lined saucepan.
Boil without stirring until the mixture threads.

Finish the frosting

Slowly pour the syrup onto the beaten egg white mixed with cream of tartar.
Beat steadily while adding the grated chocolate, cream, butter, and vanilla extract.

Recipe from a historical cookbook (Internet Archive).

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 pairs

Smell alikemoderate

Cooked together10,020 recipes

Shared aroma: sotolon (curry, maple).
Cream + buttertop 8% of all pairs

Smell alikemoderate

Cooked together41,516 recipes

Shared aroma: delta-dodecalactone (sweet, creamy).
Sugar + vanillatop 8% of all pairs

Smell alikelow

Cooked together35,032 recipes

Shared aroma: beta-damascenone (apple, rose).
Sugar + creamtop 9% of all pairs

Smell alikemoderate

Cooked together43,450 recipes

Shared aroma: 2,3-butanedione (butter, sweet).
Cream + chocolatetop 11% of all pairs

Smell alikemoderate

Cooked together5,466 recipes

Shared aroma: delta-decalactone (sweet, creamy).

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

Sugar: Forms the syrup that sets into the frosting's sweet, glossy structure.
Egg white: Whips into a foam that gives the frosting its light, airy body.
Grated chocolate: Provides the chocolate flavor and color in the frosting.

The step that matters

Pour the hot syrup slowly onto the egg white. Pouring the syrup in a thin, slow stream while beating lets it cook the egg white gently and combine evenly. Pouring too fast can deflate the foam or leave cooked streaks of egg.

“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.

Chocolate Cream171 recipes

Vanilla Ice Cream108 recipes

Chocolate Cookies76 recipes

Chocolate Fudge55 recipes

Like knowing why a recipe works?

The 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.

Chocolate Frosting for Layer Cake