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Dessert

Boston Cream Cakes

A layered cake made from a butter‑water batter, baked, then filled with a custard made from milk, eggs, sugar, and cornstarch.

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 Cakes

Oven, in the book's wordsA quick oven

Ingredients

Directions

The book says “a quick oven”. The 400°F (200°C) in the steps is the modern equivalent, not the book's own figure.

Make the cakes

  1. Combine butter and hot water in a large saucepan and heat until boiling.

  2. Add sifted flour all at once and beat with a vegetable masher until smooth.

  3. Remove from heat and let cool slightly.

  4. Add beaten egg yolks, then egg whites, baking soda, and salt.

  5. Drop spoonfuls of the mixture onto buttered baking sheets, spacing them about 2 inches apart.

  6. Bake at 400°F (200°C) for about 15 minutes.

  7. Once cooled, carefully open the sides of the cakes with a knife or scissors.

Make the custard

  1. Heat 2⅔ cups of milk in a double boiler.

  2. In a separate bowl, mix sugar, cornstarch (or flour), and beaten eggs with ⅓ cup of milk.

  3. When the milk is nearly boiling, pour in the egg mixture and stir briskly for 3 minutes until thickened.

  4. Remove from heat, add butter, and let cool.

  5. Flavor with vanilla or lemon.

Assemble

  1. Fill the opened cakes with the custard filling.

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. Butter + milktop 7% of all pairs
    Smell alikemoderate
    Cooked together81,283 recipes

    Shared aroma: (z)-4-heptenal (biscuit, cream).

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

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

  4. Butter + flourtop 12% of all pairs
    Smell alikelow
    Cooked together124,287 recipes

    Shared aroma: isobutyraldehyde (malty, green).

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

    Shared aroma: isobutyraldehyde (malty, green).

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

Flour
Provides the structure that holds the cakes together after baking.
Eggs
Add structure and richness, and set the custard as it thickens.
Butter
Adds fat for a tender crumb and rich flavour.
Milk
Forms the body of the custard and carries its flavour.
Sugar
Sweetens the custard and softens its texture.
Cornstarch
Thickens the custard as its starch swells when heated.

The step that matters

Stir the egg mixture into nearly boiling milk. Eggs can scramble if they get too hot too fast, and stirring briskly spreads the heat evenly and prevents lumps. The cornstarch needs to reach a boil to thicken fully, so the custard should be stirred until it is clearly thick.

Swap the vanilla

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

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

Fit is the average pairing score against butter, flour, egg, sugar, 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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