Not quite a burger but Tournedos Rossini [1] exists. This is a fillet steak topped with foie gras and served with black truffles. [1] http://en.wikipedia.org/w

Not quite a burger but Tournedos Rossini [1] exists. This is a fillet steak topped with foie gras and served with black truffles. [1] http://en.wikipedia.org/wiki/Tournedos_Rossini http://en.wikipedia.org/wiki/Tournedos_Rossini