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Custard Sauce

A thickened milk custard flavored with sugar, egg yolk, salt, and vanilla.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Custard Sauce

Why it works: Milk and vanilla are a kitchen classic. They rank in the top 5% of all ingredient pairs, and cooks put them together in 19,187 recipes. Both carry ethyl caproate, which smells fruity, apple peel. The science ↓

Custard Sauce

Ingredients

Directions

Make the custard

  1. Combine milk, sugar, egg yolk, salt, and vanilla in a double boiler.

  2. Cook over simmering water, stirring constantly until the mixture thickens.

Finish the sauce

  1. Strain the custard to remove any lumps.

  2. Let it cool.

  3. Add additional flavoring if desired.

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 + vanillatop 5% of all pairs
    Smell alikemoderate
    Cooked together19,187 recipes

    Shared aroma: ethyl caproate (fruity, apple peel).

  2. Sugar + vanillatop 8% of all pairs
    Smell alikelow
    Cooked together35,032 recipes

    Shared aroma: beta-damascenone (apple, rose).

  3. Milk + eggtop 18% of all pairs
    Smell alikemoderate
    Cooked together88,785 recipes

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

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

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

  5. Sugar + eggtop 21% of all pairs
    Smell alikemoderate
    Cooked together122,807 recipes

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

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

Milk
Forms the liquid base that thickens into a smooth, pourable sauce.
Egg yolk
Thickens the custard as it heats and gives it a rich texture.
Sugar
Sweetens the sauce and helps keep it smooth and tender.
Vanilla
Adds aroma and flavor to the sauce.

The step that matters

Cooking over simmering water with constant stirring. Egg yolk proteins thicken the custard gently, but too much heat or lack of stirring can scramble the eggs and leave lumps. Keeping the water at a simmer and stirring constantly lets the custard thicken evenly and smoothly.

“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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