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Dessert

Foaming Sauce

A light, frothy sauce made by beating butter and sugar, then adding hot water and vanilla.

From an old cookbook · modernised transcription
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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 ↓

Foaming Sauce

Ingredients

Directions

  1. Beat the butter and sugar together in a bowl until frothy.

  2. Place the bowl in a pan of hot water.

  3. Add the hot water and vanilla, if using.

  4. Stir in one direction until the mixture becomes a very light foam.

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. Butter + sugartop 17% of all pairs
    Smell alikemoderate
    Cooked together98,233 recipes

    Shared aroma: guaiacol (smoky, sweet).

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 richness and fat that carries flavor and helps trap air when beaten.
Sugar
Sweetens and its crystals help hold air bubbles when beaten into the butter.
Hot water
Warms and loosens the mixture, keeping it soft enough to foam.

The step that matters

Stirring until a very light foam. Beating butter and sugar traps air, and gentle stirring in one direction keeps bubbles fine and stable. Overbeating or stirring too vigorously can collapse the foam or make it dense.

“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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