Flourless Chocolate Coffin Cake

Chocolate Cake

• 10 oz unsalted butter, room temperature, plus extra to grease
• 8 egg whites, from large eggs
• 6 oz sugar, divided
• 10 oz dark chocolate (70% cocoa), cut into pieces
• 5 oz hazelnuts
  hoặc 5 oz almonds
• 10 egg yolks, from large eggs

Ganache

• 7 oz dark chocolate (70% cocoa), cut into pieces
• 6 oz heavy whipping cream
• 1 ½ tsp gel food coloring, black