I have to admit that i have never tried that myself or known anyone who has so i can't say for certain! but i dont think it will be a problem. if you make a ganache with good dark chocolate (ie not full of loads of fat and sugar) and use at least the same (if not more) chocolate than cream you will get a very sturdy ganache once set. i guess that there will be no problem putting buttercream on top of that!
but i've never known anyone use both...i've always used EITHER buttercream OR ganache to do the filling, crumb coating and icing/deorating of a cake...never both on the same cake (seems like a lot of hastle!)
But let me know how you get on!
I have actually made a cake using ganache under buttercream, It is the white 3 tiered wedding cake with flowers on it in my pictures, I made the ganache let it cool to room temp, cover bowl in plastic wrap, let sit overnight, torted, filled cakes with ganache, and frosted all 3 layers in ganache, let sit till hardens, then cover in thin layer of buttercream, it smoothed out good, it does make the cake very sweet and rich with both. HTH>
This has been a while, but I'm looking to see if anyone has ever applied ganache over buttercream for the finish??? Ganache alone doesn't seem enough, almost too chintzy.... I'm filling with chocolate buttercream, wanting to use ganache, tinted black, for a dark effect over the cake, with fondants embellishments on top and sides.
I use ganache under BC all the time and LUV it!
Here's a good link:
http://www.artandappetite.com/2009/11/ganache-instead-of-buttercream/
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