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Dessert

Boiled Custard

A custard made by boiling milk, whisking eggs, sugar, vanilla, and cornstarch, 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

Prepare

  1. Boil the milk in a saucepan.

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

  3. Dissolve the cornstarch in a small amount of the boiled milk.

Make the custard

  1. Add the dissolved cornstarch to the egg mixture.

  2. Pour the hot milk over the egg mixture. Stir gently.

  3. Return the mixture to the saucepan.

  4. Cook over low heat, stirring constantly, until it thickens. 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
Their proteins set when heated, giving the custard body and structure as it thickens.
Milk
Forms the liquid base, providing moisture and a creamy texture.
Cornstarch
Thickens the custard as its starch granules swell in heated liquid.
Powdered sugar
Adds sweetness and dissolves smoothly into the egg mixture.
Vanilla essence
Adds aroma and flavor to the custard.

The step that matters

Keep the custard below a boil. Over high heat the egg proteins can curdle and scramble, leaving lumps. Gentle, constant stirring over low heat lets the cornstarch thicken the custard smoothly while the eggs set gently.

“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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