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Dessert

Foamy Sauce

A light, foamy sauce made with butter, powdered sugar, vanilla, lemon, egg, and boiling water.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 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 ↓

Foamy Sauce

Ingredients

Directions

Make the sauce base

  1. Cream the butter in a bowl.

  2. Add the powdered sugar, vanilla extract, and the beaten yolk of the egg until light.

  3. Slowly add the boiling water while mixing.

Fold in the egg white

  1. In a separate bowl, beat the egg white until stiff.

  2. Fold the beaten egg white into the mixture and beat until light and foamy.

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. Butter + vanillatop 14% of all pairs
    Smell alikemoderate
    Cooked together20,050 recipes

    Shared aroma: guaiacol (smoky, sweet).

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

    Shared aroma: eucalyptol (eucalyptus, herbal).

  4. Butter + lemontop 16% of all pairs
    Smell alikemoderate
    Cooked together41,227 recipes

    Shared aroma: 3-hexenal (apple, fruity).

  5. Butter + eggtop 17% of all pairs
    Smell alikemoderate
    Cooked together118,967 recipes

    Shared aroma: decanal (soap, orange peel).

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

Butter
Adds fat and richness, giving the sauce a smooth, creamy body.
Powdered sugar
Sweetens the sauce and dissolves easily for a smooth texture.
Egg
The yolk adds richness and body, while the beaten white traps air for a light foam.

The step that matters

Folding in the beaten egg white. Beaten egg white is a foam of trapped air. Folding gently keeps that air in the sauce, while vigorous or overlong mixing deflates it and makes the sauce heavy.

Swap the lemon

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

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

Fit is the average pairing score against butter, sugar, vanilla, egg. 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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