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Dessert

Boiled Custard

A custard made by beating eggs with sugar, adding hot milk, cooking gently, cooling, then folding in beaten egg whites.

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

Make the custard

  1. Beat the egg yolks in a bowl.

  2. Add the sugar and mix well.

  3. Pour the hot milk over the mixture, stirring constantly.

  4. Cook in a double boiler, stirring until the custard coats the back of a spoon. Be careful not to overcook.

  5. Set the dish containing the custard in a pan of cold water and stir until moderately cool.

Finish and serve

  1. Beat the egg whites until stiff.

  2. Fold the beaten egg whites into the custard, or serve the custard in glasses with the egg whites on top.

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
Egg yolks thicken the custard as they cook, while beaten whites add lightness when folded in.
Sugar
Sweetens the custard and helps balance the richness of the milk and eggs.
Milk
Forms the liquid base of the custard, which thickens as the egg proteins set with gentle heat.

The step that matters

Cook in a double boiler until the custard coats the back of a spoon. Egg proteins thicken the custard gently, but high heat can make them curdle or scramble. Cooking slowly over simmering water and stopping at the spoon-coating stage keeps it smooth.

“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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