Rich in hazelnut and chocolate flavor, this Chocolate and Hazelnut Cake combines cocoa powder and crushed hazelnuts into the cake batter for a rich chocolatey, nutty, and buttery tasting cake. Carbonated water and yeast add a bit of lift to the batter making this cake light and moist in texture. A Nutella and chocolate icing strewn with chopped almonds or hazelnuts is the crowning glory of this decadent and absolutely scrumptious cake. A must try if you are a chocolate lover.