In a large pot, bring to a boil water, salt, and olive oil included in A. Add cannelloni and boil rapidly for 15 minutes. Drain, arrange cannelloni one next to the other on an aluminum sheet.
Stuff each cannelloni with the filling included in A.
Grease a 13 x 9 x 2-inch glass baking dish and line bottom of dish with cannelloni. Mix ingre