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Brooklyn Blackout Cake: A Decadent History and Recipe


  • Total Time: 180 minutes
  • Yield: 10-12 servings 1x

Description

Moist chocolate cake layers with rich chocolate pudding filling and chocolate crumb topping. Optional chocolate ganache.


Ingredients

Scale
  • 2 cups all-purpose flour
  • 2 cups granulated sugar
  • ¾ cup unsweetened cocoa powder (Dutch-process preferred)
  • 1 ½ teaspoons baking powder
  • 1 ½ teaspoons baking soda
  • 1 teaspoon salt
  • 1 cup buttermilk
  • ½ cup vegetable oil
  • 2 large eggs
  • 2 teaspoons vanilla extract
  • 1 cup boiling water
  • 2 ounces bittersweet chocolate, melted and cooled
  • 3 cups whole milk
  • ¾ cup granulated sugar
  • ½ cup unsweetened cocoa powder (Dutch-process preferred)
  • ¼ cup cornstarch
  • ¼ teaspoon salt
  • 4 large egg yolks
  • 4 ounces bittersweet chocolate, chopped
  • 2 tablespoons unsalted butter
  • 1 teaspoon vanilla extract
  • 1 ½ cups all-purpose flour
  • ¾ cup granulated sugar
  • ½ cup unsweetened cocoa powder (Dutch-process preferred)
  • ¾ cup (1 ½ sticks) cold unsalted butter, cut into cubes
  • ¼ teaspoon salt
  • 8 ounces bittersweet chocolate, chopped
  • 1 cup heavy cream

Instructions

  1. Preheat your oven to 350°F (175°C). Grease and flour two 9-inch round cake pans. Use parchment paper rounds in the bottom of the pans.
  2. In a large bowl, whisk together the flour, sugar, cocoa powder, baking powder, baking soda, and salt.
  3. In a separate bowl, whisk together the buttermilk, oil, eggs, and vanilla extract.
  4. Gradually add the wet ingredients to the dry ingredients, mixing on low speed until just combined.
  5. Slowly pour in the boiling water while mixing on low speed. Add the cooled melted chocolate and mix until just combined.
  6. Divide the batter evenly between the prepared cake pans. Bake for 30-35 minutes, or until a wooden skewer inserted into the center comes out clean.
  7. Let the cakes cool in the pans for 10 minutes before inverting them onto a wire rack to cool completely.
  8. In a medium saucepan, whisk together the sugar, cocoa powder, cornstarch, and salt.
  9. Gradually whisk in the milk until smooth. Then, whisk in the egg yolks.
  10. Cook over medium heat, stirring constantly, until the mixture comes to a simmer and thickens (5-7 minutes).
  11. Remove the saucepan from the heat and stir in the chopped chocolate and butter until melted and smooth.
  12. Stir in the vanilla extract.
  13. Pour the pudding into a bowl, cover with plastic wrap (pressing the plastic wrap directly onto the surface of the pudding), and refrigerate for at least 2 hours, or until completely chilled.
  14. In a medium bowl, whisk together the flour, sugar, cocoa powder, and salt.
  15. Cut in the cold butter using a pastry blender or your fingertips until the mixture resembles coarse crumbs.
  16. Chill the crumb mixture in the refrigerator for at least 30 minutes before using.
  17. If necessary, level the tops of the cake layers using a serrated knife.
  18. Place one cake layer on a serving plate or cake stand.
  19. Spread half of the chilled chocolate pudding evenly over the first cake layer.
  20. Top with the second cake layer.
  21. Spread the remaining chocolate pudding evenly over the top of the second cake layer.
  22. Generously sprinkle the chocolate crumb topping over the pudding.
  23. Refrigerate the cake for at least 1 hour before serving.
  24. Place the heavy cream in a saucepan and heat over medium heat until it just begins to simmer. Do not boil.
  25. Pour the hot cream over the chopped chocolate in a heatproof bowl.
  26. Let the mixture sit for 1 minute to allow the heat to melt the chocolate.
  27. Whisk gently until the chocolate is completely melted and the ganache is smooth and glossy.
  28. Let the ganache cool slightly before pouring or spreading it over the cake.

Notes

  • Use Dutch-process cocoa powder for a richer flavor.
  • Don’t overbake the cake.
  • Chill the pudding and crumb topping.
  • Allow the cake to chill completely before serving.
  • Add coffee for a mocha flavor.
  • Experiment with different chocolate types.
  • Sprinkle chopped nuts over the crumb topping.
  • Prep Time: 45 minutes
  • Cook Time: 35 minutes