All-Chocolate Blackout Cake from Ebinger's

DIRECTIONS

• Preheat the oven to 375 degrees F.
• Butter and lightly flour two 8-inch round cake pans.
• Make the cake: Place the cocoa in a small bowl and whisk in the boiling water to form a paste.
• Combine the chocolate and milk in a small saucepan over medium heat.
• Stir frequently until the chocolate melts, about 3 minutes.
• Remove from heat.
• Whisk a small amount of the hot chocolate milk into the cocoa paste to warm it.
• Whisk the cocoa mixture into the milk mixture.
• Return the pan to medium heat an stir for 1 minute.
• Remove and set aside to cool until tepid.
• In the bowl of a mixer, cream the butter and sugar together.
• Beat in the egg yolks, one at a time, and add the vanilla.
• Slowly stir in the chocolate mixture.
• Combine the flour, baking powder, baking soda and salt.
• Using a spatula or a wooden spoon, slowly add the flour mixture to the chocolate mixture.
• Fold until just mixed.
• In another bowl, whisk the egg whites until soft peaks form.
• Using a rubber spatula, gently fold the egg whites into the batter.
• Divide the batter between the prepared pans.
• Bake until a toothpick inserted in the center of a cakes comes out clean, about 45 minutes.
• Cool the cakes in the pans on a rack for 15 minutes.
• Gently remove the cakes from the pans and continue to cool.
• While the cake is baking, make the filling: Combine the cocoa and boiling water in a small saucepan over low heat.
• Stir in the sugar and chocolate.
• Add the dissolved cornstarch paste and salt to the pan and bring to a boil, stirring constantly.
• Boil for 1 minute.
• Remove the pan from the heat and whisk in the vanilla and butter.
• Transfer the mixture to a bowl, cover, and refrigerate until cool.
• Make the frosting: Melt the chocolate in a double boiler over hot, not simmering, water, stirring until smooth.
• Remove the top of the double boiler from the heat and whisk in the butter, 1 tablespoon at a time.
• Return the top to the hat, if necessary, to melt the butter.
• Whisk in the hot water all at once and whisk until smooth.
• Whisk in the corn syrup and vanilla.
• Cover and refrigerate for up to 15 minutes prior to using.
• Assemble the cake: Use a sharp serrated knife to slice each cake layer horizontally in half to form 4 layers.
• Set 1 layer aside.
• Place 1 layer on a cake round or plate.
• Generously swath the layer with 1/3 of the filling.
• Add the second layer and repeat.
• Set the third layer on top.
• Quickly apply a layer of frosting to the top and the sides of the cake.
• Refrigerate for 10 minutes.
• Meanwhile, crumble the remaining cake layer.
• Apply the remaining frosting to the cake.
• Sprinkle it liberally with the cake crumbs.
• Serve the cake within 24 hours, store in a cool place.
• Note: The filling ingredients make for a very runny filling, which is how a real Ebinger's cake should be.
• For those who desire a less syrupy consistency, they can stir in an additional 1 to 2 tablespoons of cornstarch.