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Dessert

Boston Cream Pie

A cake with a custard topping.

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 ↓

Boston Cream Pie

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 cake

  1. Preheat the oven to 350°F (175°C).

  2. Beat the yolks and sugar together until creamy.

  3. Add the flour, then fold in the beaten egg whites.

  4. Mix in the milk and baking powder.

  5. Pour the batter into round tins, ensuring the cake is 1.5 inches thick.

Make the custard

  1. For the custard, beat the two eggs separately, combine them with the sugar and cornstarch, then add a little cold milk.

  2. Pour this mixture into less than 1 pint of scalding milk, stirring constantly until cooked, then flavor the custard with vanilla or lemon.

Assemble

  1. Once the cake is cool, spread the custard on top.

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

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

  3. Flour + vanillatop 12% of all pairs
    Smell alikemoderate
    Cooked together19,241 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  4. Flour + milktop 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).

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

Eggs
Set the batter and custard, adding structure and richness as they cook.
Flour
Forms the gluten network that gives the cake its structure.
Sugar
Sweetens the cake and helps it stay tender and moist.
Baking powder
Releases gas in the batter, helping the cake rise.
Cornstarch
Thickens the custard as it heats, giving it a smooth, spreadable body.
Milk
Adds moisture to the cake and forms the base of the custard.

The step that matters

Cooking the custard while stirring. Eggs and cornstarch thicken as they heat, but the eggs can curdle or scorch if the mixture sits still. Stirring constantly spreads the heat evenly and keeps the custard smooth until it thickens.

Swap the vanilla

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

  1. Vanillathe original
  2. Raisinfits about as well
  3. Figfits less well
  4. Blueberryfits less well

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