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Sauce

Fluff Sauce

A warm sauce of egg yolks, milk and sugar flavoured with lemon rind, with beaten egg whites folded in.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Lemon and milk are a kitchen classic. They rank in the top 15% of all ingredient pairs, and cooks put them together in 19,053 recipes. Both carry 2-nonenal, which smells fatty, green. The science ↓

Fluff Sauce

Ingredients

Directions

Make the custard

  1. In a pan, combine the milk and thinly pared lemon rind with the sugar.

  2. Warm the mixture, then pour it over the beaten egg yolks and stir well.

  3. Return the mixture to the pan and stir until it thickens.

Finish the sauce

  1. Whisk the egg whites to stiff peaks and gently fold them into the mixture.

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. Lemon + milktop 15% of all pairs
    Smell alikemoderate
    Cooked together19,053 recipes

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

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

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

  3. Egg + milktop 18% of all pairs
    Smell alikemoderate
    Cooked together88,785 recipes

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

  4. Sugar + milktop 18% of all pairs
    Smell alikelow
    Cooked together77,875 recipes

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

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

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

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 yolks
Thicken the custard as they set with gentle heat, giving the sauce body and richness.
Egg whites
Whipped to stiff peaks, they trap air and create the light, fluffy texture.
Milk
Provides the liquid base that the yolks thicken into a smooth custard.
Castor sugar
Sweetens the sauce and helps stabilise the whipped egg whites.

The step that matters

Return the mixture to the pan and stir until it thickens. Egg yolks thicken when gently heated, but overheating can scramble them into lumps. Low heat and constant stirring keep the custard smooth.

Swap the lemon

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

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

Fit is the average pairing score against egg, sugar, milk. 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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