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Dessert

Boiled Custard

A custard made by heating milk, mixing with egg yolks, sugar, vanilla, and cornstarch, topped with meringue and served with jelly.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 11 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

The book gives no oven temperature. The 350°F (175°C) in the steps was added when the recipe was transcribed, as a starting point.

Make the custard

  1. Heat the milk in a pot until it almost boils.

  2. In a bowl, mix vanilla, salt, beaten egg yolks, sugar, and dissolved cornstarch.

  3. Add the mixture to the hot milk and cook until thickened.

Top and serve

  1. Remove from heat and top with a meringue made from beaten egg whites and sugar, flavored with lemon.

  2. Brown the meringue slightly in a 350°F (175°C) oven.

  3. Serve with a spoonful of jelly in each dish alongside the custard.

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. Vanilla + lemontop 15% of all pairs
    Smell alikemoderate
    Cooked together5,961 recipes

    Shared aroma: eucalyptol (eucalyptus, herbal).

  4. Milk + lemontop 15% of all pairs
    Smell alikemoderate
    Cooked together19,053 recipes

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

  5. Sugar + lemontop 18% of all pairs
    Smell alikelow
    Cooked together53,532 recipes

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

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 egg yolks and cornstarch thicken into custard.
Egg yolks
Thicken the custard as they cook and add richness to the texture.
Cornstarch
Thickens the custard by swelling with heat to give a smooth, set body.
Egg whites
Whip into the meringue that gives a light, airy topping that browns in the oven.

The step that matters

Cook the custard until thickened. Egg yolks and cornstarch thicken only with gentle heat. Cooking too hot or too long can curdle the eggs, while stopping too early leaves it thin.

Swap the lemon

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

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

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