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Dessert

Coffee Filling

A coffee custard filling made with cream, eggs, cornstarch, sugar, and strong black coffee.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Cream and sugar are a kitchen classic. They rank in the top 9% of all ingredient pairs, and cooks put them together in 43,450 recipes. Both carry 2,3-butanedione, which smells butter, sweet. The science ↓

Coffee Filling

Ingredients

Directions

Make the filling

  1. In a saucepan, combine the cream and sugar with the coffee and heat until boiling.

  2. Dissolve the cornstarch in a little cold coffee, then add it to the boiling mixture and let it boil for 3 minutes.

  3. Slowly pour the hot mixture over the well-beaten eggs while stirring rapidly.

  4. If the mixture is not thick enough, set it over boiling water and stir until the eggs begin to set, but do not let it curdle.

Assemble

  1. Spread the filling between layers of cake and frost with Coffee Icing.

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. Cream + sugartop 9% of all pairs
    Smell alikemoderate
    Cooked together43,450 recipes

    Shared aroma: 2,3-butanedione (butter, sweet).

  2. Cream + coffeetop 17% of all pairs
    Smell alikelow
    Cooked together2,339 recipes

    Shared aroma: 2-heptanol (bitter, floral).

  3. Sugar + coffeetop 17% of all pairs
    Smell alikelow
    Cooked together4,344 recipes

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

  4. Egg + sugartop 21% of all pairs
    Smell alikemoderate
    Cooked together122,807 recipes

    Shared aroma: 2-nonenal (fatty, green).

  5. Cream + eggtop 24% of all pairs
    Smell alikelow
    Cooked together42,166 recipes

    Shared aroma: acetic acid (sour, vinegar).

Cream and egg barely smell alike, yet cooks put them together in 42,166 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

Eggs
Thicken the custard as they set and give it a rich, smooth body.
Cornstarch
Thickens the boiling coffee mixture into a glossy, spreadable filling.
Sugar
Sweetens the filling and balances the bitterness of the coffee.
Cream
Adds fat for a softer, richer texture and a smoother mouthfeel.
Strong black coffee
Provides the main flavour and liquid base of the filling.

The step that matters

Pour the hot mixture over the eggs slowly while stirring. Adding hot liquid to eggs too quickly can scramble them. Gradual pouring while stirring tempers the eggs so they thicken smoothly instead of curdling.

“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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