It's really important, if you use a stick blender that you do NOT move it from the base of the pot for at least 20 seconds.

I have personally used this recipe , three times now, and it has come out perfectly every single time.
One time, I even used one whole large hen's egg, and the egg yolk only, from a duck egg.
My mother - who is Italian, taught me most of everything I know about good ol' fashioned, natural home cooking - says it's the most remarkable thing she's ever seen!