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Dessert

Boiled Custard

A simple custard made by whisking egg yolks with sugar and salt, then slowly heating with warm milk and vanilla.

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

Boiled Custard

Ingredients

Directions

Make the custard

  1. In a saucepan, heat the milk over medium heat until it is warm but not boiling.

  2. In a bowl, whisk together the egg yolks, sugar, and salt until well combined.

  3. Slowly pour the warm milk into the egg mixture, whisking constantly to prevent curdling.

  4. Return the mixture to the saucepan and cook over low heat, stirring constantly until it thickens.

  5. Remove from heat and stir in the vanilla extract.

Cool and serve

  1. Cool before serving.

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. 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. Egg + sugartop 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

Egg yolks
Thicken the custard as they set with gentle heat, giving it body and richness.
Milk
Forms the liquid base and provides moisture for the custard.
Sugar
Adds sweetness and balances the richness of the yolks and milk.
Vanilla extract
Adds aroma and a warm, familiar flavour.

The step that matters

Adding the warm milk to the yolks. Egg yolk proteins set when heated, so pouring warm milk in slowly while whisking spreads the heat evenly and prevents the yolks from scrambling into curdled lumps.

“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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