Preheat oven to 190 degrees C. Lightly grease a 20x30cm baking dish.
Cook the beef and pork in a frypan over medium-high heat until evenly brown. Drain grease and transfer meat to a large bowl. Place onion and garlic in the frypan and cook until onion is tender. Transfer to bowl with beef. Mix the bread crumbs, parsley and oregano into the bowl.
Spread 1/2 the pasta sauce over the bottom of the baking dish. Stuff cannelloni shells with the meat mixture, arrange in the baking dish and cover with remaining sauce.
Cover pan with foil, and bake 40 minutes in the preheated oven. Uncover, sprinkle with cheese and continue baking 20 minutes until bubbly.