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Dessert

Boiled Custard

A simple custard made by simmering milk with vanilla or lemon rind, sugar, and eggs, then thickening over low heat.

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

Prepare the milk

  1. Rinse a pan with cold water.

  2. Add the milk and flavorings to the pan and simmer until flavored.

  3. Stir in the sugar until dissolved.

Make the custard

  1. Strain the mixture over the eggs, stirring constantly.

  2. Return the mixture to the pan and stir over low heat until it thickens.

  3. For a safer method, combine the egg and milk mixture in a jug and place it in a pan of hot water until thickened.

  4. Stir in the cream about five minutes before the custard cools for added richness.

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. Vanilla + sugartop 8% of all pairs
    Smell alikelow
    Cooked together35,032 recipes

    Shared aroma: beta-damascenone (apple, rose).

  3. Sugar + creamtop 9% of all pairs
    Smell alikemoderate
    Cooked together43,450 recipes

    Shared aroma: 2,3-butanedione (butter, sweet).

  4. Vanilla + creamtop 15% of all pairs
    Smell alikelow
    Cooked together12,301 recipes

    Shared aroma: 2-nonanone (fruity, floral).

  5. Milk + creamtop 18% of all pairs
    Smell alikemoderate
    Cooked together29,399 recipes

    Shared aroma: delta-dodecalactone (sweet, creamy).

Vanilla and sugar 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 custard sets in.
Egg yolks
Proteins set as they heat, thickening the custard into a smooth texture.
Egg white
Adds protein that helps the custard set.
Sugar
Sweetens the custard and dissolves into the milk.
Cream
Adds fat for extra richness and a smoother mouthfeel.

The step that matters

Stir over low heat until it thickens. Egg proteins begin to set around 70°C (160°F) and curdle if overheated, so gentle heat and constant stirring keep the custard smooth.

“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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