Name: Mocha Filling
Ingredients: 2 cups powdered sugar; 1 egg-sized piece of butter; 4 tablespoons strained coffee; 4 tablespoons cocoa; 1 tablespoon vanilla

Why it works: Coffee and cocoa work together. They rank in the top 3% of all ingredient pairs, and cooks put them together in 91 recipes. Both carry sotolon, which smells curry, maple. The science ↓

Mocha Filling

Ingredients

Directions

In a bowl, mix the powdered sugar and butter with your hands until well combined.
Dissolve the mixture with the strained coffee, cocoa, and vanilla.

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.

Coffee + cocoatop 3% of all pairs

Smell alikemoderate

Cooked together91 recipes

Shared aroma: sotolon (curry, maple).
Cocoa + vanillatop 4% of all pairs

Smell alikemoderate

Cooked together357 recipes

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

Smell alikelow

Cooked together35,032 recipes

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

Smell alikemoderate

Cooked together1,391 recipes

Shared aroma: sotolon (curry, maple).
Butter + vanillatop 14% of all pairs

Smell alikemoderate

Cooked together20,050 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

Powdered sugar: Provides sweetness and bulk, forming the body of the filling.
Butter: Adds fat and richness, giving the filling a smooth, creamy texture.
Cocoa: Supplies chocolate flavour and deep colour to the filling.
Strained coffee: Adds liquid to dissolve the sugar and deepens the chocolate aroma.

Swap the cocoa

How well each one fits the dish's main ingredients (sugar, egg, butter, coffee, vanilla):

Cocoathe original
Almondfits about as well
Hazelnutfits about as well
Pecansfits less well

Fit is the average pairing score against sugar, egg, butter, coffee, 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.