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Dessert

Boston Cream Cakes

Boston Cream Cakes are layered cakes with a custard filling, baked at 400°F.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 13 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 choux batter

  1. Combine the butter and hot water in a large saucepan.

  2. Heat the mixture until it boils.

  3. Add the sifted flour all at once.

  4. Mix the batter well with a vegetable masher until smooth.

  5. Remove the saucepan from heat and let the batter cool slightly.

  6. Add the beaten egg yolks to the batter.

  7. Add the beaten egg whites to the batter.

  8. Stir in the baking soda and salt.

  9. Drop spoonfuls of the batter onto buttered baking sheets, spacing them about two inches apart.

Bake and cool

  1. Bake the cakes in a preheated oven at 400°F (200°C) for about 15 minutes until golden.

  2. Once the cakes have cooled, carefully slice them open on the side.

Make the filling and assemble

  1. Heat ⅔ pint of milk in a double boiler for the filling.

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

  3. When the milk is nearly boiling, pour the egg mixture into the milk.

  4. Stir the mixture for 3 minutes until it thickens.

  5. Remove the filling from heat.

  6. Add the butter to the filling.

  7. Flavor the filling with vanilla or lemon.

  8. Fill the sliced cakes with the custard mixture.

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

Eggs
Bind the batter and, as they expand in the oven, help the cakes puff and hold their hollow shape.
Flour
Provides the starch and structure that set the cake walls and the thickened custard.
Butter
Adds richness and tenderness to the batter and a smooth, rich mouthfeel to the filling.
Baking soda
Adds a small lift and helps the cakes brown in the oven.
Sugar
Sweetens the filling and balances its richness.
Milk
Forms the liquid base of the custard filling, which thickens when heated with the eggs and starch.

The step that matters

Stirring the custard until it thickens. The egg and starch mixture can curdle or lump if it overheats or is not stirred constantly. Starch swells and thickens the milk as it heats, and the eggs set the custard, so steady stirring keeps it smooth.

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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