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Dessert

Boiled Custard

A custard made by boiling milk and eggs with sugar, then cooling and adding flavoring.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Milk and lemon are a kitchen classic. They rank in the top 15% of all ingredient pairs, and cooks put them together in 19,053 recipes. Both carry 2-nonenal, which smells fatty, green. The science ↓

Boiled Custard

Ingredients

Directions

Make the custard

  1. Boil the milk in a double boiler, then remove from heat.

  2. Beat the eggs and sugar together.

  3. Slowly pour the hot milk into the egg mixture, stirring constantly.

  4. Return the mixture to the double boiler and stir rapidly until it thickens and coats the spoon, about 5 minutes.

Cool and flavor

  1. Remove from heat and set in a pan of cold water to cool.

  2. Once cool, add the flavoring extract.

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 + lemontop 15% of all pairs
    Smell alikemoderate
    Cooked together19,053 recipes

    Shared aroma: 2-nonenal (fatty, green).

  2. Sugar + lemontop 18% of all pairs
    Smell alikelow
    Cooked together53,532 recipes

    Shared aroma: 2-nonenal (fatty, green).

  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 + lemontop 19% of all pairs
    Smell alikelow
    Cooked together44,316 recipes

    Shared aroma: (e,e)-2,4-decadienal (fatty, deep fried).

Sugar and lemon barely smell alike, yet cooks put them together in 53,532 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 eggs thicken into a smooth custard.
Eggs
Thicken the custard as they set with heat, giving it body and structure.
Egg yolks
Add richness and extra thickening power, giving a smoother, creamier texture.
Sugar
Adds sweetness and softens the eggs' flavor in the finished custard.

The step that matters

Adding the hot milk to the eggs. Pouring hot milk into the eggs too quickly can scramble them. Pour slowly while stirring constantly so the eggs warm gradually and thicken smoothly.

Swap the lemon

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

  1. Vanillafits better
  2. Figfits about as well
  3. Raisinfits about as well
  4. Lemonthe original

Fit is the average pairing score against milk, sugar, egg. 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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