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Boston Cream Pie Petit Fours

This recipe is so intricate that it literally took me all day to accomplish, but I say it was well worth it. What I did was I baked a sponge sheet cake and using a square fondant cutter, I cut out a bunch of little squares. I made a custard as well and once it was chilled enough, I made sandwiches with the cute out squares and the custard and finally soaked them in a chocolate ganache to make little Boston Cream Pies!

 

Boston Cream Pie Petit Fours

Sponge Cake

Martha Stewart

  • Unsalted butter, for pans
  • 3/4 cup all-purpose flour, plus more for pans
  • 3/4 cup corn starch
  • 6 large eggs, separated
  • 1 1/2 teaspoons vanilla extract
  • 3/4 cup plus 6 tablespoons granulated sugar
  • 1/4 teaspoon salt

Vanilla Custard

Elinor Klivans

  • 1 cup whole milk
  • 3 large egg yolks
  • 1/3 cup granulated sugar
  • 4 teaspoons corn starch
  • 2 tablespoons unsalted butter, at room temperature
  • 1 teaspoon vanilla extract

Chocolate Glaze

Elinor Klivans

  • 1/3 cup heavy cream
  • 4 tablespoons unsalted butter, cut into 1/2 inch cubes
  • 3 tablespoons light corn syrup
  • 4 ounces semi-sweet chocolate, finely chopped
  • 1 teaspoon vanilla extract
  1. In a saucepan over medium heat, warm the milk until small bubbles appear around the edges of the pan. Remove from the heat
  2. In a heatproof bowl, combine the egg yolks, sugar, and cornstarch and whisk until smooth. Slowly whisk in the hot milk until thoroughly blended
  3. Return the egg-yolk mixture to the saucepan and place over medium heat. Cook, whisking constantly, until the mixture comes to a boil and thickens, about 3 minutes. Continue cooking, stirring constantly for 1 minute longer to cook completely
  4. Pour the custard through a fine-mesh sieve into a clean bowl. Stir in the butter and vanilla
  5. Press a piece of plastic wrap directly onto the surface of the custard to prevent a skin from forming and poke a few holes in the plastic with the tip of a sharp knife to allow steam to escape. Refrigerate until well chilled, at least 2 hours or overnight
  6. Preheat the oven to 350° F. Butter the bottom and sides of an 11-by-17-inch rimmed baking sheet and a 9×9″ square baking pan. Line the bottom of each pan with parchment paper, and butter again. Flour the pans, and set aside
  7. In a small bowl, sift together the flour and cornstarch; set aside
  8. In the bowl of an electric mixer fitted with the whisk attachment, beat egg yolks, vanilla, and 3/4 cup sugar on high until thick and pale, about 3 minutes. Transfer egg-yolk mixture to a large bowl. Wash and dry the mixer bowl and the whisk attachment
  9. Combine the egg whites and salt in the mixer bowl, and beat on medium speed until soft peaks form, about 1 1/2 minutes. With the mixer running, slowly add the remaining 6 tablespoons sugar. Continue beating until stiff and glossy, about 1 minute
  10. Fold the egg-white mixture into the egg-yolk mixture. In three additions, fold the reserved flour mixture into the egg mixture. Transfer two-thirds of the batter to the baking sheet, and smooth the top with an offset spatula. Transfer remaining batter to the 9×9″ pan; smooth the top with the spatula. Bake until light golden brown and a cake tester inserted into the center comes out clean, about 20 minutes. Transfer the pans to wire racks to cool; turn out the cakes, remove the parchment paper, wrap in plastic wrap, and freeze until ready to use
  11. In a saucepan over medium heat, combine the heavy cream, butter, and corn syrup and cook, stirring, until the butter melts and the mixture is hot but not boiling. Remove the pan from the heat and add the chocolate
  12. Let stand for about 30 seconds, then stir until the chocolate is completely melted and the glaze is smooth. Stir in the vanilla

Assembly

  1. After a few hours, remove cakes from freezer. Run a knife under hot water and slice the 9×9″ cake in half horizontally. Spread cake and cake halves out. Using a square fondant cutter, cut out as many cake squares as you possibly can (save scraps for snacking!)
  2. Remove custard from the fridge. Take one cake square and “frost” the top of it with the custard. Stack another cake square on top and repeat again with the custard. Stack a third cake square on top of that custard layer and set aside. Repeat with remaining cake squares
  3. Place all cake squares on rimmed baking sheet and spread enough of the chocolate ganache over each stack to fully coat it. Place the baking sheet in the fridge and allow the chocolate to firm up. Then enjoy!

Here are just the plain sponge cake and custard sandwiches

Adding on that ganache

I was worried they would get too soggy if I made sure every single piece of the cake was covered

The finished product!

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