You can make a quick and easy chocolate ganache filling if you prefer it instead of the raspberry and buttercream. To make chocolate ganache, finely chop 8 ounces quality semi-sweet chocolate and place in a bowl. Heat 8 ounces of heavy cream until hot but not boiling. Pour over the chocolate and cover for 5 minutes. Stir until smooth. Allow to sit at room temperature until it reaches piping consistency.