Chocolate Cake with Raspberry Filling

1 . Stage

Preheat the oven to 300 degrees F (150 degrees C).

2 . Stage

Combine chopped chocolate and hot coffee in a bowl. Stir occasionally until chocolate is melted and mixture is smooth. Set aside.

3 . Stage

Sift sugar, flour, cocoa powder, baking soda, baking powder, and salt together in a large bowl.

4 . Stage

Beat eggs in a bowl using an electric mixer until slightly thickened and lemon-colored. Slowly add oil, buttermilk, vanilla extract, and melted chocolate mixture. Beat until well combined. Add sugar-flour mixture; beat on medium speed until just combined. Divide batter between the prepared cake pans.

5 . Stage

Bake in the preheated oven until a toothpick inserted into the center comes out clean, 1 hour to 1 hour and 10 minutes. Let cool completely in pans on wire racks, about 30 minutes. Invert layers onto racks.

6 . Stage

While cakes are cooling, bring heavy cream, sugar, and corn syrup to a boil over low heat in a small saucepan. Whisk until sugar dissolves. Add chocolate; whisk until melted. Add butter; whisk until smooth. Let ganache frosting cool until spreadable, about 10 minutes.

7 . Stage

While frosting and cakes continue to cool, puree raspberries in a food processor. Press through a fine mesh strainer with the back of a spoon into a saucepan. Pour in sugar and cornstarch; bring to a boil over medium-low heat. Cook until thickened and reduced, 5 to 7 minutes. Stir in lemon zest. Remove raspberry filling from heat.

8 . Stage

Cut each cake layer in 1/2 horizontally to produce 4 equal layers. Spread 1/3 raspberry filling onto each of 3 layers and stack. Place top layer onto cake. Spread ganache frosting evenly from center of top layer down the sides of the cake.