Prepare the Chocolate Cake Base: Start by preheating your oven to 175°C and greasing three 9-inch round pans. Next, sift all your dry ingredients together in a large bowl. In another bowl, whisk the eggs, buttermilk, oil, sour cream, and vanilla until well combined. Gradually fold the wet ingredients into the dry mixture until smooth.

Add the Coffee Magic: Slowly stir in that hot coffee until the batter is completely smooth. Divide the batter evenly between your prepared pans and bake for 28-32 minutes.

Create the Chocolate Mousse: While your cakes cool, heat 80ml of heavy cream until it’s just simmering. Pour this over your chopped milk chocolate and let it sit for about 2 minutes before stirring into a silky smooth mixture. Allow this chocolate base to cool completely.

Whip the Mousse to Perfection: In a separate bowl, beat the remaining cold heavy cream with powdered sugar and vanilla until you get stiff peaks. Gently fold your cooled chocolate mixture into the whipped cream in three additions.

Assemble Your Masterpiece: Place your first completely cooled cake layer on a wire rack set over a baking sheet. Spread a generous layer of that gorgeous chocolate mousse on top. Repeat with the second layer, then crown it with the third layer. Refrigerate this assembled cake for at least 30 minutes.

Prepare the Ganache Coating: Heat your cream until simmering, then pour it over the chopped dark chocolate. Let it sit undisturbed for 3 minutes, then stir until you have a silky smooth mixture. Stir in the butter and corn syrup. Cool for 15-20 minutes until it’s the perfect pouring consistency.

Create the Final Glory: Pour the ganache over your chilled Dark Chocolate Mousse Cake, starting from the center and allowing it to flow naturally over the sides. Finally, create chocolate curls with a vegetable peeler and scatter them artfully across the top.