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Dessert

Boiled Custard

A custard made by heating milk, whisking egg yolks, vanilla, and sugar, then cooking until thickened.

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. Heat the milk and salt in a saucepan over medium heat until warm.

  2. Whisk the egg yolks, vanilla, and sugar together in a bowl until well combined.

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

  4. Return the mixture to the saucepan and cook over low heat, stirring continuously until it thickens. Do not let it boil.

Cool

  1. Remove from heat and cool before using.

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. Vanilla + sugartop 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).

Vanilla and sugar 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 during gentle cooking and add richness.
Milk
Forms the liquid base that thickens into a smooth, pourable custard.
Sugar
Adds sweetness and helps keep the yolks from scrambling when heated.

The step that matters

Cooking the custard over low heat without boiling. Egg yolks thicken through gentle heat. If the mixture boils or cooks too fast, the proteins curdle and the custard turns grainy. Stirring constantly spreads the heat evenly and prevents scorching on the pan bottom.

“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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