Prepare the Pans: Lightly grease three 8-inch round cake pans with butter or nonstick spray. Line the bottoms with rounds of parchment paper, ensuring they fit snugly. Grease the parchment as well, then dust the insides with cocoa powder.
Mix the Dry Ingredients: Preheat your oven to 350°F (175°C). In a large mixing bowl, whisk together the all-purpose flour, granulated sugar, cocoa powder, baking powder, baking soda, and fine sea salt.
Combine Wet Ingredients: In a separate bowl, whisk together the eggs, buttermilk, neutral oil, and vanilla extract until smooth. Pour the wet mixture into the dry ingredients and mix on low speed until combined.
Incorporate Hot Coffee: Gradually whisk in the hot strong coffee to the batter until it reaches a thin, pourable consistency. Divide the batter evenly among the prepared cake pans.
Bake the Cake Layers: Place the pans in the preheated oven and bake for 22–28 minutes. A toothpick inserted into the center should come out with a few moist crumbs.
Cool the Cake Layers: Once baked, remove the pans from the oven and allow them to cool for 10–15 minutes. Invert the cakes onto wire racks and let them cool completely.
Toast the Nuts and Coconut: Lower the oven temperature to 325°F (165°C). Spread the chopped pecans on a sheet pan and toast for 6–8 minutes. In the same oven, toast the shredded coconut for 4–6 minutes.
Prepare the Coconut-Pecan Filling: In a saucepan, whisk together the evaporated milk, sugar, and egg yolks. Cook over medium heat, stirring constantly until thickened. Stir in butter, vanilla, salt, toasted coconut, and pecans, and let cool.
Make the Ganache: Place the finely chopped dark chocolate in a heatproof bowl. Heat the cream until just simmering, then pour it over the chocolate. Stir in the butter and vanilla until smooth.
Level the Cake Layers: Once cooled, use a serrated knife to level the layers if necessary. Place one layer on a cake board, cut side up.
Assemble the Cake: Spread a dollop of ganache on the first layer to help the filling stick. Add half of the coconut-pecan filling, then place the second layer on top and repeat the process.
Crumb Coat the Cake: Spread a thin layer of ganache around the cake to seal in crumbs. Refrigerate for 20–30 minutes until set.
Final Ganache Layer: Apply a thicker layer of ganache on the top and sides of the cake. Smooth out with a bench scraper and chill for an additional 10–15 minutes.
Decorate the Cake: Toss the toasted pecans and coconut with gold sanding sugar and gently press this mixture around the bottom of the cake. Decorate the top with whole pecan halves and dark chocolate curls.
Chill and Serve: Chill the completed cake for at least 1 hour before slicing. Use a knife dipped in hot water for clean cuts.