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Dessert

Boiled Custard

A custard made by heating milk and sugar, tempering eggs, cooking until thickened, then adding flour.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 ingredients
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Why it works: Milk and flour are a kitchen classic. They rank in the top 14% of all ingredient pairs, and cooks put them together in 78,219 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓

Boiled Custard

Ingredients

Directions

Make the custard

  1. In a saucepan, combine the milk and sugar, and heat until hot.

  2. In a bowl, beat the eggs and gradually add a little of the hot milk mixture to temper them.

  3. Return the egg mixture to the saucepan and cook over low heat, stirring constantly until thickened.

  4. Once thickened, remove from heat and let cool slightly before adding flour to achieve desired consistency.

Serve

  1. Serve by heaping spoonfuls to create an uneven surface.

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 + flourtop 14% of all pairs
    Smell alikelow
    Cooked together78,219 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  2. Sugar + flourtop 15% of all pairs
    Smell alikemoderate
    Cooked together92,116 recipes

    Shared aroma: phenylacetaldehyde (hawthorne, honey).

  3. Egg + flourtop 15% of all pairs
    Smell alikelow
    Cooked together106,462 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  4. Egg + milktop 18% of all pairs
    Smell alikemoderate
    Cooked together88,785 recipes

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

  5. Milk + sugartop 18% of all pairs
    Smell alikelow
    Cooked together77,875 recipes

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

Milk and flour barely smell alike, yet cooks put them together in 78,219 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
Thicken the custard as they set when gently heated, giving it body.
Milk
Forms the liquid base that the eggs thicken into a pourable custard.
Sugar
Sweetens the custard and helps keep the egg proteins tender while cooking.
Flour
Adds body and helps stabilize the custard so it can reach the desired consistency.

The step that matters

Cooking the egg mixture over low heat. Egg proteins set around 160°F and can scramble if overheated. Cooking gently while stirring constantly keeps the custard smooth and evenly thickened.

“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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