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Custard Kettle

A custard made by tempering egg yolks with heated milk and flavoring extracts.

From an old cookbook · modernised transcription
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Why it works: Nutmeg and cinnamon match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 11,917 recipes. Both carry estragole, which smells anise, licorice. The science ↓

Custard Kettle

Ingredients

Directions

  1. Heat the milk in a kettle of boiling water until it foams slightly.

  2. Mix the beaten and strained egg yolks with the sugar in a bowl.

  3. Gradually add several tablespoons of the boiling milk to the egg mixture, stirring constantly.

  4. Slowly stir the egg mixture back into the boiling milk.

  5. Stir constantly until the mixture thickens slightly, but do not let it curdle.

  6. Remove from heat and cool immediately in cold water or a cold dish.

  7. Add flavoring extracts after removing from the stove.

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. Nutmeg + cinnamontop 1% of all pairs
    Smell alikestrong
    Cooked together11,917 recipes

    Shared aroma: estragole (anise, licorice).

  2. Vanilla + cinnamontop 1% of all pairs
    Smell alikestrong
    Cooked together5,287 recipes

    Shared aroma: 4-methoxybenzaldehyde (sweet, anise).

  3. Milk + vanillatop 5% of all pairs
    Smell alikemoderate
    Cooked together19,187 recipes

    Shared aroma: ethyl caproate (fruity, apple peel).

  4. Lemon + nutmegtop 5% of all pairs
    Smell alikestrong
    Cooked together11,318 recipes

    Shared aroma: beta-phellandrene (minty, terpene).

  5. Lemon + cinnamontop 7% of all pairs
    Smell alikestrong
    Cooked together7,950 recipes

    Shared aroma: beta-phellandrene (minty, terpene).

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 and, with the yolks, sets into a smooth, creamy custard.
Egg yolks
Thicken the custard as they set with gentle heat and add richness.
Sugar
Sweetens the custard and helps soften the set texture of the yolks.

The step that matters

Stir constantly until the mixture thickens slightly, but do not let it curdle.. Egg proteins set with heat, and if the custard gets too hot or sits unstirred, they tighten and curdle. Constant stirring and removing it from heat as soon as it thickens keeps the texture smooth.

Swap the lemon

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

  1. Figfits better
  2. Blueberryfits better
  3. Raisinfits better
  4. Lemonthe original

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