Sage & Olive Oil Buttercream

I realize that this may sound like a strange combination, but I think that's why I wanted to try it.  I was making Randy's blueberry cake for her birthday and I didn't want to put plain old buttercream icing on top (even though I love the stuff).  So I decided to get creative.  The flavours are very mellow; you get the slightest taste of herb cutting into the sweetness.  So, without further ado, here's the recipe!