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Dessert

Chocolate Boiled Icing Without Eggs

A chocolate icing made by boiling sugar, water, and chocolate, then adding vanilla.

From an old cookbook · modernised transcription
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Why it works: Chocolate and vanilla are a kitchen classic. They rank in the top 5% of all ingredient pairs, and cooks put them together in 10,020 recipes. Both carry sotolon, which smells curry, maple. The science ↓

Chocolate Boiled Icing Without Eggs

Ingredients

Directions

Make the icing

  1. Boil sugar and water in a deep saucepan for 5 minutes.

  2. Add chocolate and boil until it reaches candy point.

  3. Remove from heat and let cool slightly.

  4. Stir in vanilla extract and beat briefly.

Finish

  1. Spread over cake.

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. Chocolate + vanillatop 5% of all pairs
    Smell alikemoderate
    Cooked together10,020 recipes

    Shared aroma: sotolon (curry, maple).

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

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

  3. Sugar + chocolatetop 13% of all pairs
    Smell alikemoderate
    Cooked together15,404 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

Sugar
Sweetens the icing and, when boiled to candy point, sets firm as it cools.
Chocolate
Adds chocolate flavor and richness, and its fat helps the icing feel smooth.
Vanilla extract
Adds aroma that rounds out the chocolate flavor.

The step that matters

Boil to candy point. Candy point is the sugar concentration and temperature at which the icing will set properly. Stopping too early leaves it runny, and boiling too long makes it hard and grainy. Cooling slightly before beating lets it thicken to a spreadable texture.

“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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