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Mocha Sauce

A thickened sauce made from egg yolks, sugar, salt, coffee, and whipped cream.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Sugar and cream 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 ↓

Mocha Sauce

Ingredients

Directions

Make the custard

  1. In a bowl, mix the yolks of two eggs, sugar, and salt.

  2. Gradually add the hot coffee while stirring.

  3. Cook in a double boiler until thickened, stirring constantly.

Finish the sauce

  1. Cool the mixture and fold in the whipped cream.

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. Sugar + creamtop 9% of all pairs
    Smell alikemoderate
    Cooked together43,450 recipes

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

  2. Coffee + creamtop 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. Egg + creamtop 24% of all pairs
    Smell alikelow
    Cooked together42,166 recipes

    Shared aroma: acetic acid (sour, vinegar).

Egg and cream 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

Egg yolks
Thicken the sauce as they cook and set into a smooth custard.
Sugar
Adds sweetness and balances the bitterness of the coffee.
Strong hot coffee
Provides the mocha flavor and liquid for the sauce.
Whipped cream
Adds lightness and a soft, airy texture when folded in.

The step that matters

Cook in a double boiler until thickened, stirring constantly. Egg yolks can curdle or scramble if they get too hot. Gentle, constant stirring over indirect heat lets them thicken smoothly into a custard.

“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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