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Boston Cream Pie

This American classic, first made by a Boston chef in the 1850s, isn't actually a pie at all, it's a cake: two sponge layers with custard-cream filling and a shiny chocolate glaze. This recipe calls for a 9-by-2-inch cake pan; if you use an 8-inch wide pan, the batter will overflow.
Holiday Baking 2002, Special Issue 2002
  • Yield Makes one 9-inch cake
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Ingredients

  • Unsalted butter, for cake pan
  • 1 cup sifted cake flour, (not self-rising), plus more for pan
  • 1/4 teaspoon salt
  • 4 large eggs
  • 1 cup sugar
  • 1/4 cup plus 2 tablespoons milk
  • 1 vanilla bean, split lengthwise
  • 6 large egg yolks
  • 3/4 cup sugar
  • 6 1/2 tablespoons cornstarch
  • 1/8 teaspoon salt
  • 3 cups milk
  • 2 teaspoons pure vanilla extract
  • 4 ounces best-quality semisweet chocolate, coarsely chopped
  • 1/2 cup heavy cream

Directions

  1. To make cake: Heat oven to 350 degrees. Lightly butter and flour a 9-by-2-inch round cake pan. Line with parchment paper; set aside.
  2. Sift together cake flour and salt. Sift again, twice; set aside. In the bowl of an electric mixer fitted with the whisk attachment, mix eggs and sugar until well combined. Place the bowl over a pot of gently simmering water; whisk until mixture is warm, about 110 degrees, and sugar is dissolved, about 6 minutes. Remove from heat; place bowl on mixer. With the whisk attachment, beat egg mixture on high until thickened and pale, about 6 minutes.
  3. Meanwhile, in a small saucepan, combine milk and split vanilla bean. Place over medium heat until hot, being careful not to let boil. Remove and discard vanilla bean. With egg mixture beating, pour hot milk into egg mixture in a slow, steady stream. Turn off mixer. Transfer to a medium bowl; fold in flour mixture. Pour into prepared pan.
  4. Bake until cake is golden brown and springs back when gently pressed, about 30 minutes. Transfer to a wire rack to cool for 15 minutes. Remove from pan; cool completely.
  5. To make filling: Prepare an ice-water bath. In a large bowl, whisk egg yolks; set aside. In a medium saucepan, combine sugar, cornstarch, and salt. Gradually stir in milk. Cook over medium heat, stirring constantly, until mixture thickens and begins to bubble, about 5 minutes. (It is essential that mixture come to a boil.) Remove from heat.
  6. Whisking constantly, slowly pour hot milk mixture into egg yolks. Return mixture to saucepan. Cook over medium heat, stirring constantly, until mixture begins to bubble, about 3 minutes. (It is essential that mixture bubble again.) Remove from heat; stir in vanilla extract.
  7. Transfer filling to a medium bowl. Place the bowl in the ice bath. Stir from time to time until mixture cools; it thickens as it cools. Cover with plastic wrap, pressing wrap against the filling to prevent a skin from forming. The filling may be refrigerated overnight at this stage, or it is ready to use.
  8. To make glaze and assemble cake: Split cake into two layers; spread bottom half with chilled filling. Place in refrigerator to set, about 30 minutes. Wrap remaining half of cake with plastic wrap; set aside.
  9. In a medium-size heat-proof bowl, or the top of a double boiler, set over a pot of gently simmering water, combine chocolate and heavy cream. Stir occasionally until chocolate melts, about 12 minutes. Remove from heat; set aside to cool for 10 minutes.
  10. Remove cake from refrigerator; top with reserved layer. Transfer cake to serving plate; pour chocolate glaze over top. Allow to set 20 minutes before serving.

Recipe Reviews

  • terbear72
    4 Jan, 2012

    I just made this cake. It looked great about 1/2 way through, then when the timer went off, I opened the oven and it had completely dropped! I will take another reviewers advice and add 3 t of baking soda.

  • ninakaursee
    8 Sep, 2011

    Is the sponge cake supposed to be cut in half horizontally in order to spread the filling?

  • khgotch
    4 Jan, 2011

    The creme and the chocolate glaze were perfect but the cake recipe is certainly flawed. I think the baking soda was accidentally ommited. I cooked it without soda thinking that the eggs were intended to be the rising agent, but that didn't do the trick. The cake itself was very chewy and dense. I would reccomend adding three teaspoons of baking powder or soda to make this recipe perfect!

  • cheen1981
    11 Oct, 2010

    looks delicious. I can't wait to try this recipe

  • Googe
    11 Feb, 2009

    It looks like from the recipe, it calls for 1/8 tsp. salt.

  • evelynloren
    24 May, 2008

    what can i use instead of cornstarch, since unavailable.

  • chefbb317
    12 Feb, 2008

    1/8 teaspoon salt

  • JParent
    12 Jan, 2008

    The cream for this recipe calls for 1 salt. Does this mean 1 teaspooon? That's what I did and it was much too salty. Also the amount of constarch made the mixture much too thick.

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