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Dessert

Boiled Custard

A custard made by heating milk, mixing with egg yolks and whites, and topping with whipped egg whites and preserved fruit.

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

Make the custard

  1. Heat the milk nearly to boiling.

  2. Beat the yolks until light and stir in the sugar.

  3. Slowly add the hot milk to the yolk mixture, stirring constantly.

  4. Stir in 5 whipped egg whites.

  5. Return to the heat and stir until thick, but do not let it boil.

  6. Season with vanilla and pour into custard cups.

Top and garnish

  1. Whip 2 egg whites to stiff peaks and fold in a heaping tablespoon of powdered sugar.

  2. Top each custard cup with the whipped egg whites and garnish with a preserved berry or jelly.

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 set with gentle heat, giving it body and richness.
Milk
Forms the liquid base that the yolks thicken into a smooth custard.
Egg whites
Whipped whites trap air, adding lightness to the custard and forming the soft topping.
Sugar
Adds sweetness and helps stabilize the whipped egg whites.

The step that matters

Return to the heat and stir until thick, but do not let it boil. Egg yolks thicken as their proteins set with gentle heat. If the custard gets too hot or boils, the proteins tighten too far and the mixture can curdle or turn 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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