Preheat your oven to 350°F (175°C). Grease and flour two 9-inch round cake pans. In a large bowl, whisk together the granulated sugar, all-purpose flour, unsweetened cocoa powder, baking soda, baking powder, and kosher salt. In another bowl, combine the eggs, buttermilk, strong black coffee, vegetable oil, and vanilla extract. Add the wet ingredients to the dry ingredients and mix until well combined. Divide the batter evenly between the prepared pans.
Place the pans in the preheated oven and bake for 30 to 35 minutes, or until a toothpick inserted into the center of the cakes comes out clean. Remove the cakes from the oven and let them cool in the pans for 10 minutes. Then, turn the cakes out onto a wire rack to cool completely.
While the cakes are cooling, prepare the strawberry frosting. In a mixing bowl, beat the softened butter until creamy. Gradually add the powdered sugar, one cup at a time, beating well after each addition. Add the heavy cream, vanilla extract, and fresh strawberry puree, and continue to beat until the frosting is light and fluffy.
In a saucepan over medium heat, heat the heavy cream until it begins to simmer. Remove from heat and add the semisweet chocolate. Let it sit for a few minutes, then whisk until smooth and glossy.
Once the cake layers have cooled, place one layer on a serving plate. Spread a generous amount of strawberry frosting over the top. Place the second cake layer on top and apply a crumb coat of frosting to seal in any loose crumbs. Refrigerate the cake for 30 minutes to set the crumb coat. Afterward, apply a final layer of frosting over the entire cake.
Pour the prepared ganache over the top of the cake, allowing it to drip down the sides. Garnish with fresh strawberries for an added touch of elegance.