In large skillet, combine meat, onion and garlic. Cook until onion is tender and meat is brown. Remove from heat. Cool. Add spinach, eggs, crumbs, ¼ cup (50 mL) of the cheese, oregano, salt and pepper. Stuff uncooked cannelloni with meat mixture. Pour thin layer of tomato sauce on bottom of 13x9-inch (3.5 L) pan. Arrange cannelloni in single layer. Pour remaining sauce over, being certain to cover all pasta. Sprinkle graded mozzarella cheese. Cover with aluminum foil. Bake in 375°F (190?C) oven about 1 hour or until tender. 6 to 8 servings. Take off aluminium foil 35mins after initial start and continu cooking for the remainder of the hour.