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Dessert

Royal Icing for Cakes

A stiff, lemon‑flavored icing made from egg whites and icing sugar.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 3 ingredients
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Why it works: Sugar and lemon are a kitchen classic. They rank in the top 18% of all ingredient pairs, and cooks put them together in 53,532 recipes. Both carry 2-nonenal, which smells fatty, green. The science ↓

Royal Icing for Cakes

Ingredients

Directions

  1. Put the egg whites into a round-bottomed bowl.

  2. Add enough icing sugar to form a stiff batter.

  3. Mix well with a wooden spoon, adding lemon juice until the mixture is firm enough for a spoon to stand upright in it.

  4. If a smaller quantity is needed, heat 1 egg white in a clean pot with an iron spoon until light and stiff.

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 + lemontop 18% of all pairs
    Smell alikelow
    Cooked together53,532 recipes

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

  2. Egg + lemontop 19% of all pairs
    Smell alikelow
    Cooked together44,316 recipes

    Shared aroma: (e,e)-2,4-decadienal (fatty, deep fried).

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

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

Sugar and lemon barely smell alike, yet cooks put them together in 53,532 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 whites
Whipped structure that holds air and gives the icing its body.
Icing sugar
Sweetness and bulk that stiffens the egg whites into a set icing.
Lemon juice
Acidity that helps stabilise the whipped egg white foam.

The step that matters

Adding the icing sugar and lemon juice. Sugar and acid must be added gradually while mixing so the egg white foam stays stable and firm. Adding too much sugar at once can make the icing dense or stiff in uneven patches.

Swap the lemon

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

  1. Vanillafits better
  2. Raisinfits about as well
  3. Lemonthe original
  4. Datesfits less well

Fit is the average pairing score against egg, sugar. 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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