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Boiled Custard

A custard made by heating milk, mixing with egg yolks and sugar, then folding in beaten egg whites.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 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 in a saucepan until it steams.

  2. In a bowl, beat together the egg yolks and sugar until well combined.

  3. Stir the egg mixture into the steaming milk until it thickens.

  4. Remove from heat and let cool.

  5. Add flavoring and salt to taste.

Top and serve

  1. In a separate bowl, beat the egg whites with lemon extract and enough powdered sugar to stiffen.

  2. Spoon the beaten egg whites over the cooled custard in 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. 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

Milk
Forms the liquid base that the egg yolks thicken into a smooth custard.
Egg yolks
Their proteins set when gently heated, thickening the milk into custard.
Sugar
Adds sweetness and helps stabilise the beaten egg whites.
Egg whites
Whipped into a foam that gives a light, airy topping to the custard.

The step that matters

Stirring the egg mixture into the steaming milk. Egg proteins set when they get hot, so if the mixture is added too fast or the heat is too high, it can scramble into lumps. Stirring constantly keeps the eggs evenly warmed 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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