Gnudi are little balls which are more or less like a kind of gnocchi; balls are made of spinach and ricotta without any pasta covering them. So, hence the name Naked Ravioli. These rustic, naked ravioli have a long history, going back to Roman times, and perhaps even much earlier. For this gnudi, I did not add the whole egg, more the dough is loose the more flour will be required. So use only the yolk, so that the gnudi is soft and succulent (and not hard) after it's cooked. These are very…