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Sauce

Custard Sauce

A thickened milk and egg yolk sauce sweetened with sugar and flavored.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 ingredients
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Custard Sauce

Why it works: Milk and egg 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 ↓

Custard Sauce

Ingredients

Directions

Make the custard

  1. Pour the milk into a saucepan and bring it to a boil.

  2. Remove from heat and let it cool for 1-2 minutes.

  3. Pour the warm milk onto the egg yolks, whisking continuously.

  4. Return the mixture to the saucepan and stir over low heat until thickened, ensuring it does not boil.

Flavour and serve

  1. Add the sugar and your chosen flavouring, then serve.

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.

Photo for illustrative purposes only · Contact us to use it

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. Milk + eggtop 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

Milk
Forms the liquid base that the custard thickens into a smooth, pourable sauce.
Egg yolks
Their proteins set when gently heated, thickening the sauce and giving it richness.
Sugar
Adds sweetness and balances the richness of the egg yolks and milk.

The step that matters

Thickening over low heat without boiling. Egg yolks thicken by gentle protein setting. If the mixture gets too hot or boils, the proteins tighten and curdle, leaving a grainy, lumpy sauce instead of a smooth one.

“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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