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Dessert

Foam Sauce

A light, sweet foam made from beaten egg whites, sugar, flavoring, lemon juice, and boiling water.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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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 ↓

Foam Sauce

Ingredients

Directions

  1. Beat the egg whites to a stiff froth.

  2. Add the powdered sugar and flavor with vanilla, sherry, or brandy.

  3. Stir in the lemon juice.

  4. Quickly add the boiling water and serve immediately.

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

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

  2. Vanilla + lemontop 15% of all pairs
    Smell alikemoderate
    Cooked together5,961 recipes

    Shared aroma: eucalyptol (eucalyptus, herbal).

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

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

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

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

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

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

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 whites
Whipped into a stiff foam that gives the sauce its light, airy body.
Powdered sugar
Sweetens the sauce and helps stabilize the beaten egg white foam.
Lemon juice
Adds acidity that brightens the flavor and helps keep the foam stable.
Boiling water
Gently warms the foam and loosens it into a pourable sauce.

The step that matters

Quickly add the boiling water and serve immediately. Beaten egg white foam slowly deflates and loses volume as it sits. Adding the hot water at the end and serving right away keeps the sauce light and airy.

Swap the lemon

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

  1. Figfits better
  2. Blueberryfits better
  3. Peachfits better
  4. Lemonthe original

Fit is the average pairing score against egg, sugar, 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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