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Dessert

Boiled Custard

A custard made by heating milk with egg yolks, sugar, and flavorings.

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. Scald the milk in a double boiler.

  2. In a bowl, beat the egg yolks, sugar, and salt together.

  3. Slowly pour the hot milk into the egg mixture while stirring continuously.

  4. Return the mixture to the double boiler and cook until thickened, stirring constantly.

  5. Remove from heat immediately to prevent curdling.

Finish

  1. Strain through a fine strainer and add flavorings.

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 + sherrytop 8% of all pairs
    Smell alikemoderate
    Cooked together506 recipes

    Shared aroma: piperonal (bitter, coconut).

  3. Sugar + vanillatop 8% of all pairs
    Smell alikelow
    Cooked together35,032 recipes

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

  4. Nutmeg + vanillatop 10% of all pairs
    Smell alikestrong
    Cooked together2,781 recipes

    Shared aroma: eucalyptol (eucalyptus, herbal).

  5. Milk + sherrytop 14% of all pairs
    Smell alikemoderate
    Cooked together1,479 recipes

    Shared aroma: 2,3,5-trimethylpyrazine (cocoa, roasted).

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, and add richness.
Milk
Forms the liquid base that the yolks thicken into a smooth custard.
Sugar
Sweetens the custard and softens the flavor of the yolks.

The step that matters

Remove from heat immediately when thickened. Egg yolks begin to scramble and curdle once they get too hot. Taking the custard off the heat as soon as it thickens keeps it smooth, since residual heat continues to cook it.

Swap the nutmeg

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

  1. Cinnamonfits better
  2. Nutmegthe original
  3. Clovefits about as well
  4. Peppermintfits less well

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