To do this in fondant, I would suggest covering the cake and then painting by hand. Different sized brushes (with different amounts of dye) could give a more random and realistic look for the wood too.
The picture does look like a ganached cake smeared with buttercream. I agree with cakeartist86, if she wants it in fondant then cover in fondant and hand paint it. I guess you would need to cover it in white And then paint on the brown. I'd be interested to see how that turns out. Good luck
I just saw this cake on Jennifer of Cup a Dee Cakes' blog and she used fondant. I know it's not exactly the same as what you have here, but thought it might help to see another cake like it done in fondant.
http://cupadeecakes.blogspot.com/2012/05/birch-wood-grain-wedding-cake.html
Instead of straight dye, I'm thinking about painting the fondant with many different shades of brown, thinned buttercream icing, so that it gets that '
"textured look" she also wants me to add some burlap fondant flowers to it. She is really stumping me today... Burlap fondant? I would use a real piece of burlap to transfer the texture onto the fondant, but I am afraid it would not be edible then? How else would I get that "burlap" look?
I have seen an ' impression mat ' that would give the exact look of burlap in hobby lobby - in the clay section! Or you could just use the edge of a metal ruler or something similar and just make lots of lines in the pattern?
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