If the ganache is made at the appropriate consistency and if you cake is kept air conditioned, all should be well for a 30 minute delivery. Just make sure you do not add the topper details until you get there and that your car is very well cooled and that no sun can get on the cake in transit. I delivered a ganache covered cake just a few weeks ago in 90 degree whether. I followed the steps above and had no problems.
9/16/13 at 1:44pm