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Dessert

Boiled Custard

A sweet custard made by boiling milk with eggs and sugar, then flavored with vanilla.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 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. Bring the sweet milk to a boil in a saucepan.

  2. Beat the egg yolks and 2 egg whites in a bowl until light.

  3. Add the sugar to the eggs and mix well.

  4. Pour the hot milk over the egg mixture and stir to combine.

  5. Return the mixture to the stove and cook until it thickens.

  6. Flavor with vanilla.

Finish and serve

  1. Fold in the beaten egg whites mixed with powdered sugar.

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

Egg yolks
Thicken the custard as they cook, giving it a smooth, rich body.
Sweet milk
Forms the liquid base that the eggs thicken into a custard.
Egg whites
Beaten and folded in, they add lightness and a airy texture.
Sugar
Sweetens the custard and helps stabilise the beaten eggs.

The step that matters

Cooking the custard until it thickens. Egg yolks thicken as their proteins set with heat, but overheating can curdle them. Cook gently and stir constantly so the custard thickens smoothly instead of turning grainy.

“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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