01 -
Coat three 9-inch round cake pans thoroughly with nonstick flour spray. Line the bottoms with parchment circles, then spray again to ensure easy release.
02 -
Place chopped semisweet chocolate in a heatproof bowl. Pour boiling water over the chocolate, let stand for 1 minute, then stir gently until completely melted and glossy.
03 -
In a clean bowl, beat egg whites with an electric mixer on high speed until stiff peaks form. Set aside and clean beaters before proceeding.
04 -
Sift together all-purpose flour, cocoa powder, baking soda, and salt in a large bowl. Whisk to combine and aerate the mixture.
05 -
Beat softened butter and granulated sugar in a large mixing bowl on medium speed until pale and fluffy, approximately 3 minutes.
06 -
Beat in egg yolks, one at a time, ensuring each is fully mixed before adding the next. Add the melted chocolate and vanilla extract, mixing until smooth.
07 -
On low speed, add one-third of the flour mixture, followed by half the buttermilk. Repeat, ending with the remaining flour. Mix only until just combined.
08 -
Gently fold a third of the beaten egg whites into the batter to lighten it, then carefully fold in the remainder just until incorporated for maximum volume.
09 -
Evenly divide the batter among prepared pans. Smooth the tops with a spatula. Bake in a preheated 350°F oven for 25 to 30 minutes, or until a toothpick tests clean. Cool completely in pans on wire racks.
10 -
In a saucepan, whisk together egg yolks, evaporated milk, and light brown sugar. Add butter pieces. Cook over medium-low heat, whisking constantly, until thickened, about 12 minutes. Remove from heat, stir in coconut, pecans, vanilla, and salt. Cool to room temperature.
11 -
Combine heavy cream and corn syrup in a small bowl. Microwave until just boiling, then add chopped semisweet chocolate. Wait 30 seconds, then whisk until smooth. Let cool until the glaze is just thick enough to drizzle.
12 -
Place one cake layer on a serving platter and spread with a third to half of the coconut pecan frosting. Repeat with remaining layers and frosting, leaving sides unfrosted. Generously drizzle with chocolate glaze, allowing it to drip naturally. Slice with a serrated knife.