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Dessert

Boiled Custard

A custard made by boiling milk and mixing with eggs, sugar, cornstarch, 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

Prepare

  1. Boil the milk in a saucepan.

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

Make the custard

  1. Slowly pour the boiling milk over the egg mixture while stirring gently.

  2. Return the mixture to the saucepan and cook over low heat, stirring constantly, until the custard thickens but do not let it boil.

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. Egg + milktop 18% of all pairs
    Smell alikemoderate
    Cooked together88,785 recipes

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

  4. Sugar + milktop 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

Eggs
Set and thicken the custard as they cook, giving it body and richness.
Milk
Forms the liquid base of the custard and provides creaminess.
Cornstarch
Thickens the custard by swelling with heat, adding body without extra eggs.
Powdered sugar
Adds sweetness and dissolves smoothly into the milk and eggs.

The step that matters

Return the mixture to the saucepan and cook over low heat, stirring constantly. Egg proteins set with heat, and if the custard boils or cooks too hard it can curdle or turn grainy. Gentle, constant stirring over low heat keeps the eggs evenly thickened while the cornstarch sets the texture.

“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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