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Dessert

Boiled Custard

A simple custard made by heating milk, whisking eggs and sugar, then cooking until thickened and flavored with vanilla.

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

Prepare the custard

  1. In a saucepan, heat the milk over medium heat until warm.

  2. In a bowl, whisk together the eggs and sugar 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.

Finish and serve

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

  2. Let 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

Milk
Provides the liquid base that thickens into a smooth, pourable custard.
Eggs
Thicken the custard as they set gently with heat, giving it body and richness.
Sugar
Sweetens the custard and helps keep the egg proteins tender while cooking.

The step that matters

Cooking the custard over low heat while stirring. Egg proteins set at around 160°F to 180°F and can scramble if the mixture gets too hot or is not stirred. Gentle, constant stirring keeps the custard smooth and lets it thicken evenly.

“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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