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Dessert

Boiled Custard

A sweet custard made by cooking eggs, milk, sugar, starch, and vanilla until thickened.

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

Prepare

  1. Beat the eggs slightly.

  2. Mix in salt and sugar.

  3. Mix potato starch with a little milk.

Make the custard

  1. Add the rest of the milk and cook in a double boiler for 5 minutes until thickened.

  2. Pour the thickened milk mixture slowly over the eggs while stirring steadily.

  3. Cook again in the double boiler for a few minutes, ensuring it does not curdle.

  4. Add vanilla just before removing from the heat.

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 + potatotop 9% of all pairs
    Smell alikemoderate
    Cooked together3,611 recipes

    Shared aroma: (e,z)-2,6-nonadienal (cucumber, melon).

  4. Potato + vanillatop 16% of all pairs
    Smell alikemoderate
    Cooked together383 recipes

    Shared aroma: sotolon (curry, maple).

  5. Egg + milktop 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

Eggs
Set and thicken the custard as they cook, giving it body and structure.
Potato starch
Thickens the milk so the custard becomes smooth and holds its shape.
Milk
Forms the liquid base of the custard and adds richness and moisture.
Sugar
Adds sweetness and contributes to the smooth, soft texture of the custard.

The step that matters

Pour the thickened milk over the eggs slowly while stirring. Adding hot liquid to eggs too quickly can scramble them. Slow pouring with constant stirring tempers the eggs gently, so the custard cooks smooth instead of curdling.

Swap the potato

How well each one fits the dish's main ingredients (egg, sugar, milk, vanilla):

  1. Sweet potatofits better
  2. Arrowrootfits better
  3. Capsicumfits better
  4. Potatothe original

Fit is the average pairing score against egg, sugar, milk, vanilla. Candidates are from the same food group and used in at least 100 recipes.

“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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