Place remaining cake layer on top. Frost cake using about 2/3 of chocolate ganache. If ganache has not firmed yet to a consistency of regular frosting do the following: Remove half of ganache from bowl and set bowl over a few ice cubes. Stir constantly until slightly thicker. Wait a few minutes and allow ganache to thicken. If ganache was over chilled and has become too firm to spread, soften in a microwave oven in 3-4 second increments.
Chocolate Ganache or Sauce: