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Dessert

Boiled Frosting

A sweet glaze made by boiling sugar and water, then folding into beaten egg whites with vanilla and tartar.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 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 water in a saucepan.

  2. Boil until it forms a clear syrup. Remove from heat.

Make the frosting

  1. Beat the egg whites in a separate bowl until stiff peaks form.

  2. Slowly pour the syrup into the beaten egg whites while stirring with a spoon until cool.

  3. Add vanilla and cream of tartar or lemon juice to whiten.

  4. Use an earthen baking dish for boiling and beating.

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

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

  3. Vanilla + creamtop 15% of all pairs
    Smell alikelow
    Cooked together12,301 recipes

    Shared aroma: 2-nonanone (fruity, floral).

  4. Sugar + eggtop 21% of all pairs
    Smell alikemoderate
    Cooked together122,807 recipes

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

  5. 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

Sugar
Dissolves into the water to form a syrup that sweetens and gives the frosting body.
Egg whites
Whip into a foam that traps air, giving the frosting its light, fluffy structure.
Cream of tartar or lemon juice
Its acidity helps stabilize the whipped egg white foam so it holds its shape.
Vanilla extract
Adds aroma and a mild, rounded flavour to the frosting.

The step that matters

Pour the hot syrup slowly while beating. Adding the hot syrup in a thin, steady stream while the whites are beating lets it cook the egg whites gently and spread evenly. Pouring it in quickly can deflate the foam or leave cooked streaks, so the frosting loses its smooth, stable 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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