01 -
Coat round cake pans thoroughly with nonstick flour spray. Line bases with parchment paper circles, then spray again to ensure cakes release cleanly.
02 -
Place chopped semisweet chocolate in a heatproof bowl. Pour boiling water over chocolate, let sit for 1 minute, then stir gently until fully melted and smooth. Set aside to cool slightly.
03 -
In a clean, grease-free mixing bowl, beat egg whites on high until stiff peaks form. Reserve for folding into batter later.
04 -
Sift together all-purpose flour, cocoa powder, baking soda, and salt. Whisk to evenly distribute and aerate.
05 -
In a large bowl, beat softened butter and granulated sugar until pale and fluffy, about 3 minutes on medium speed. Scrape the bowl as needed for even mixing.
06 -
Beat in egg yolks one at a time, allowing each yolk to become fully incorporated. Mix in melted chocolate and vanilla extract until uniform.
07 -
Add flour mixture in three additions, alternating with buttermilk. Begin and end with flour. Mix on low speed until each addition is just blended.
08 -
Gently fold one-third of whipped egg whites into the batter to lighten. Carefully fold in remaining whites; stop when no streaks remain, maintaining batter's volume.
09 -
Divide batter evenly between prepared pans, smoothing tops. Bake at 350°F for 25-30 minutes for three layers or 35-40 minutes for two thicker layers. Cakes are ready when a toothpick inserted into the center emerges clean. Cool completely in pans before unmolding.
10 -
Combine egg yolks, evaporated milk, and light brown sugar in saucepan. Whisk, add butter, and cook over medium-low, whisking frequently, about 12 minutes, until thick and bubbling. Remove from heat; stir in coconut, toasted pecans, vanilla extract, and salt. Let cool to room temperature to ensure proper spreadability.
11 -
Place heavy cream and corn syrup in a microwave-safe bowl and heat until boiling. Add chopped semisweet chocolate, allow to stand 30 seconds, then whisk until smooth and glossy. Let glaze cool until slightly thickened but still pourable.
12 -
Set first cake layer on serving platter. Spread with 1/3 to 1/2 of cooled coconut pecan frosting. Add next cake layer(s), repeating frosting. Leave sides exposed. Drizzle chocolate glaze over top, allowing it to run down naturally. Cut with a sharp serrated knife for clean slices.