So, I made the cakes….6” golden hazelnut and 9” chocolate Domingo. I filled both cakes with the chocolate praline silk meringue buttercream and frosted with whipped milk chocolate ganache.
Sherrie - 16 November 2011 01:41 PM
I believe a few people on the forum have made their own praline paste—it’s not as smooth as the commercially made products, but hazelnut butter (like peanut butter) may also be useful in this process. There are several threads like this
Honestly, Sherrie, if I’d read any of these threads before I started, I don’t know that I would have even attempted this buttercream; for every post praising the flavour, there was one describing the problems of making it! I learned first hand how to deal with those….. from a too cool curdled butter/ pastry cream mix to the 3 attempts at heating the sugar syrup (the first 2 having turned to caramel when I turned my back for a second) 
To introduce “crunch”, I processed my praline to coarser granules instead of powder or paste. (I went with the praline for texture as I was was afraid the hazelnut dacquoise would be too sweet)
Sherrie - 15 November 2011 12:09 PM
The chocolate praline silk meringue buttercream is the most decadent ferrero rocher-esque filling. It is better than the real thing.
I have to agree…...having survived the experience of making it, I can say that it is one of the most fabulous things I have ever tasted
!
Julie - 15 November 2011 09:19 AM
Every year I make the domingo chocolate cake and top with hazelnut mousseline, it is a combination to die for. The Domingo is mellower than the choc fudge, I think it’s a great match for the milk chocolate in ferrero rocher.
Julie, the Domingo cake was a great suggestion…the crumb is far more moist/less crumbly than the chocolate fudge (though I still love that cake) and the flavour went really well with the CPSMBC filling.
The whipped milk chocolate ganache (I used the milk chocolate ganache recipe from the CB but the same ratio of chocolate to cream as the light whipped ganache) as frosting was a better idea on paper than in reality. The flavour was what I was looking for, but the consistency…....it was like frosting a cake with an airy mousse and the pale colour magnified every flaw. I couldn’t do the smooth finish and piping I had planned and ended up with very “rustic” looking cakes (At some point while I was fighting with the ganache, I gave up on the idea of stacking the cakes)
Both cakes were delicious in the end
. Birthday boy and most guests thought the hazelnut cake reminded them most of a Ferrero Rocher. The ratio of hazelnut to chocolate was off in the domingo cake…..it would have worked better with more of the CPSMBC (there’s no such thing as too much of this stuff) perhaps by torting it.
Thanks again for all of your suggestions…...