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Dessert

Coffee Mousse

A chilled mousse made with eggs, sugar, coffee, cream, and a salt‑ice bath.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 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 ↓

Coffee Mousse

Oven, in the book's wordsA very slow oven

Ingredients

Directions

Make the mousse

  1. Beat the eggs in a bowl.

  2. Add the sugar and beat until combined.

  3. Stir in the coffee and beat again.

  4. Whip the cream until thick and fold it into the egg mixture.

  5. Transfer the mixture to a mold.

Freeze in salt and ice

  1. Pack the mold in a mixture of 3 parts salt to 1 part ice and let it stand for 3 to 4 hours.

  2. Add more ice as needed to keep the mixture cold.

  3. Before covering the mold, place buttered paper (butter side up) over the mousse.

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

Eggs
Whisked eggs give the mousse its airy, aerated base and help it set smooth.
Cream
Whipped cream adds lightness and a rich, creamy texture when folded in.
Sugar
Sweetens the mousse and balances the bitterness of the coffee.
Strong coffee
Provides the main coffee flavour and aroma.

The step that matters

Folding in the whipped cream. Cream must be whipped until thick but not overbeaten, then folded gently into the egg mixture. Stirring it vigorously knocks out the air trapped in the whipped cream, which makes the mousse dense rather than light.

“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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