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Dessert

Boiled Icing

A sugar-based icing made by boiling sugar and water, then mixing with egg whites and flavorings.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Vanilla and almond match in chemistry and in kitchens. They rank in the top 4% of all ingredient pairs, and cooks put them together in 3,961 recipes. Both carry eucalyptol, which smells eucalyptus, herbal. The science ↓

Boiled Icing

Ingredients

Directions

Make the syrup

  1. Boil sugar and water until it forms a thread when tested with a fork.

Combine and finish

  1. Gradually pour the syrup onto the beaten egg whites while stirring constantly.

  2. Once mixed, add glycerine, vanilla, and bitter almond extracts.

  3. Beat until thick enough to spread on 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. Vanilla + almondtop 4% of all pairs
    Smell alikestrong
    Cooked together3,961 recipes

    Shared aroma: eucalyptol (eucalyptus, herbal).

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

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

  3. Sugar + almondtop 18% of all pairs
    Smell alikemoderate
    Cooked together15,679 recipes

    Shared aroma: 1-penten-3-one (fish, pungent).

  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
Dissolved in water and boiled into a syrup that sets the icing's sweet, glossy body.
Egg whites
Beaten into a foam that gives the icing its light, airy structure.
Glycerine
Helps keep the icing soft and prevents it from becoming brittle as it cools.
Bitter almond extract
Adds a strong almond aroma that flavors the icing.

The step that matters

Pouring the hot syrup onto the egg whites. Pour the syrup slowly in a thin stream while beating constantly. Pouring too fast can deflate the foam, and the hot syrup gently cooks the egg white proteins, which sets and stabilizes the icing.

Swap the almond

How well each one fits the dish's main ingredients (sugar, egg, vanilla):

  1. Almondthe original
  2. Chestnutfits about as well
  3. Hazelnutfits less well
  4. Macadamia nutfits less well

Fit is the average pairing score against sugar, egg, vanilla. Candidates are from the same food group and used in at least 100 recipes.

“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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