Preheat and Prep: Preheat oven to 350°F (175°C). Grease and flour two 9-inch cake pans or line with parchment paper.Make Chocolate Cake Layers: Sift flour, cocoa, baking powder, baking soda, and salt. Whisk eggs, milk, oil, vanilla, and sugar. Combine wet and dry ingredients until just mixed. Stir in boiling water. Divide batter into pans and bake 30–35 minutes. Cool 10 minutes, then transfer to wire racks.Prepare Cherries: Pit fresh cherries or drain canned cherries. Mix with 2 tbsp Kirsch if desired.Whip Cream: Beat heavy cream with powdered sugar until soft peaks form. Chill bowl and beaters for best results.Assemble Cake: Optionally slice cake layers horizontally. Place first layer on plate, spread whipped cream, scatter half the cherries. Add second layer, repeat cream and cherries. Frost sides and top with remaining whipped cream.Garnish: Sprinkle chocolate shavings on top and optionally drizzle cherry syrup. Chill at least 1 hour before serving.Serve & Enjoy: Slice, serve, and enjoy this moist, decadent Black Forest cake!