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Dessert

Soft Custard Sauce

A light custard sauce made with egg yolks, milk, sugar, and flavoring.

From an old cookbook · modernised transcription
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Why it works: Egg and milk are a kitchen classic. They rank in the top 18% of all ingredient pairs, and cooks put them together in 88,785 recipes. Both carry 2-nonenal, which smells fatty, green. The science ↓

Soft Custard Sauce

Ingredients

Directions

Make the custard

  1. Boil the milk or scald it in a double boiler.

  2. Beat the egg yolks and sugar together until light.

  3. Add the egg mixture to the milk and stir until it thickens slightly.

  4. Remove from heat and let it cool.

Serve

  1. When ready to serve, mix in the flavoring.

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

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

  2. Milk + sugartop 18% of all pairs
    Smell alikelow
    Cooked together77,875 recipes

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

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

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

Milk and sugar barely smell alike, yet cooks put them together in 77,875 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 milk as they set gently with heat, giving the sauce its body and smooth texture.
Milk
Forms the liquid base that the egg yolks thicken into a pourable custard.
Sugar
Sweetens the sauce and helps the yolks stay smooth when beaten.

The step that matters

Add the egg mixture to the milk and stir until it thickens slightly. Egg yolks set when heated, so the mixture can curdle if it gets too hot or is not stirred. Stirring steadily while it thickens keeps the sauce smooth.

“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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