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Dessert

Boiled Frosting

A frosting made by boiling sugar and water, then whisking into beaten egg white.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 ingredients
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Boiled Frosting

Why it works: Sugar and vanilla are a kitchen classic. They rank in the top 8% of all ingredient pairs, and cooks put them together in 35,032 recipes. Both carry beta-damascenone, which smells apple, rose. The science ↓

Boiled Frosting

Ingredients

Directions

Make the syrup

  1. Combine sugar and boiling water in a saucepan and stir over gentle heat until sugar dissolves.

  2. Gradually bring the mixture to a boil and boil slowly without stirring until a soft ball forms in cold water (113°C).

Finish and serve

  1. Cool slightly, then pour the syrup slowly over the beaten egg white while continuously beating.

  2. Add the vanilla or lemon juice and continue beating until the frosting thickens.

  3. Pour the frosting over the 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.

Photo for illustrative purposes only · Contact us to use it

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

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

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

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

  3. Egg + vanillatop 23% of all pairs
    Smell alikelow
    Cooked together27,347 recipes

    Shared aroma: 1-octen-3-ol (mushroom, earthy).

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

Egg white
Whipped into foam, it traps air and gives the frosting its light, fluffy structure.
Granulated sugar
Dissolved into syrup and cooked, it sets the frosting's sweetness and firm texture as it cools.

The step that matters

Pouring the hot syrup into the egg white. Pour the syrup slowly while beating continuously. Pouring too fast or without beating can cook or deflate the egg white, so the frosting fails to thicken into a smooth, stable foam.

“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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