I'm making an ice cream cake for a friend and she asked if I could cover the cake with ganache. Last time I covered something frozen with ganache, it just cooled down the ganache and kept it from spreading. Is it possible to cover an ice cream cake with ganache (or whipped ganache)? Maybe if I work faster?
Yes, the top half will be actual ice cream, softened then refrozen in my 8" pan. Ganache would be so yummy, but I don't know if it would work.
ok, i am with you now 
You could make your ganache - and let it cool slightly.
When cool - have your cake sitting on a cake rack over a tray all ready to go - and then you could pour your ganache over it.
Honestly - i think that would be far better than trying to spatular it on and smooth it out...as that means your cake is sitting out for too long.
It can be done - as long as the ganache isn't to hot -
You would get a glossy smooth finish doing it that way.
Ganache coolS down quickly once on the cake - so then i would just put the cake, rack and tray back in the freezer until the ganache has set.
Bluehue
I watched some show on food network a year or two or three ago where someone went to carvel to learn how to make ice cream cakes. They had to ice and smooth the whole cake in less than 3 minutes because the icing/ice cream/whipped cream would get to hard to work with after that. So I would say it would be the same with ganache, a game of speed.
When I first read the post, I thought, yet please. Ganache on ice cream sounds fantastic! At least you know no matter what, it will taste great!
I fill my ice cream cakes with ganache and ice with whipped topping. They are like a big hot fudge sundae. So as was already stated i do think its a game of speed, if you are going to ice the outside of the cake with ganache.
When that warm icing hits the ice cream it will start to melt so you got to get it back in the freezer asap.
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