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Dessert

Mocha Filling

A sweet chocolate and coffee flavored filling for cakes.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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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

Oven, in the book's wordsA moderate oven

Ingredients

Directions

Make the filling

  1. Cream the powdered sugar and butter together.

  2. Add the cocoa, cold brewed coffee, and vanilla, then mix thoroughly.

Assemble

  1. Spread between cake layers and ice the top.

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.

  1. Coffee + cocoatop 3% of all pairs
    Smell alikemoderate
    Cooked together91 recipes

    Shared aroma: sotolon (curry, maple).

  2. Vanilla + cocoatop 4% of all pairs
    Smell alikemoderate
    Cooked together357 recipes

    Shared aroma: sotolon (curry, maple).

  3. Sugar + vanillatop 8% of all pairs
    Smell alikelow
    Cooked together35,032 recipes

    Shared aroma: beta-damascenone (apple, rose).

  4. Coffee + vanillatop 9% of all pairs
    Smell alikemoderate
    Cooked together1,391 recipes

    Shared aroma: sotolon (curry, maple).

  5. 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

Butter
Provides fat and richness, giving the filling a smooth, creamy body.
Powdered sugar
Adds sweetness and dissolves easily, helping the filling stay smooth.
Cocoa
Supplies chocolate flavor and color to the mocha filling.
Coffee
Adds a roasted, bitter aroma that deepens the chocolate flavor.

The step that matters

Creaming the powdered sugar and butter together. Beating the butter with sugar traps air and softens the fat, so the filling turns light and spreads evenly. Under-creaming leaves a dense, gritty texture.

Swap the cocoa

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

  1. Cocoathe original
  2. Almondfits about as well
  3. Hazelnutfits less well
  4. Chestnutfits less well

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

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