To make the filling, heat the oil in a frying pan and sauté the shallots until translucent. Add the beef and cook, mashing it with a fork until it loses its raw colour. Then mix it in a bowl with the mortadella or ham, ricotta or curd cheese, grated cheese and egg. Season if necessary.
If you are using dried cannelloni, cook them for about 15 minutes, or the time stated on the pack, but