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Dessert

Boiled Custard

A simple custard made by heating milk, whisking egg yolks with sugar, adding starch, and 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 the custard base

  1. Heat the milk in a rice boiler until almost boiling.

  2. In a bowl, beat the egg yolks with the powdered sugar.

  3. Mix the corn starch with a little cold milk and add it to the egg mixture.

Cook and serve

  1. Add the egg mixture to the hot milk, stirring constantly until it thickens.

  2. Once thickened, remove from heat and stir in the vanilla.

  3. Let it cool, then pour into cups.

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. Corn + vanillatop 9% of all pairs
    Smell alikemoderate
    Cooked together1,943 recipes

    Shared aroma: ethyl cinnamate (sweet, balsamic).

  4. Milk + corntop 10% of all pairs
    Smell alikemoderate
    Cooked together6,955 recipes

    Shared aroma: hexanal (green, grassy).

  5. Milk + eggtop 18% of all pairs
    Smell alikemoderate
    Cooked together88,785 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 and give it a rich, smooth body.
Milk
Forms the liquid base that the eggs and starch thicken into custard.
Powdered sugar
Sweetens the custard and dissolves smoothly into the egg yolks.
Corn starch
Stabilises the custard and helps it thicken without curdling.

The step that matters

Stirring the egg mixture into the hot milk. Egg yolks set at around 70°C and can scramble if the mixture overheats or stops being stirred. Constant stirring keeps the heat even so the custard thickens smoothly.

“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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