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Dessert

Boiled Custard

A custard made by heating milk, mixing with eggs and sugar, then baking in a double boiler and served with whipped cream.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Flour and rye match in chemistry and in kitchens. They rank in the top 8% of all ingredient pairs, and cooks put them together in 1,320 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓

Boiled Custard

Ingredients

Directions

Make the custard

  1. In a double boiler, heat the milk until boiling, reserving 1 cup to thin the egg yolks.

  2. Beat the egg yolks with half of the sugar, then add the cornstarch (or flour).

  3. Gradually pour the yolk mixture into the hot milk, stirring constantly.

  4. Once thickened, pour the mixture over the beaten egg whites.

Finish and serve

  1. Beat the remaining sugar into the egg whites just before adding the custard to prevent lumps.

  2. Stir until well mixed and flavor with rye whiskey if desired.

  3. Serve in cups topped with whipped cream.

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. Flour + ryetop 8% of all pairs
    Smell alikestrong
    Cooked together1,320 recipes

    Shared aroma: isobutyraldehyde (malty, green).

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

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

  3. Milk + ryetop 12% of all pairs
    Smell alikemoderate
    Cooked together918 recipes

    Shared aroma: ethyl 2-methylbutyrate (fruity, apple).

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

    Shared aroma: isobutyraldehyde (malty, green).

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

    Shared aroma: phenylacetaldehyde (hawthorne, honey).

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
Yolks thicken the custard as they set with gentle heat and add richness.
Sweet milk
Forms the liquid base that the yolks and starch thicken into custard.
Sugar
Adds sweetness and helps keep the beaten egg whites stable.
Cornstarch or flour
Starch swells in hot liquid, adding body and helping the custard thicken smoothly.

The step that matters

Pouring the yolk mixture into the hot milk. Egg yolk proteins set at moderate heat, so adding the yolks slowly while stirring constantly tempers them and prevents scrambling or curdling into lumps.

“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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