2 cans (14-1/2 ounces each) Italian diced tomatoes, undrained
1 can (8 ounces) tomato sauce
3 cups shredded fully cooked beef rump roast
1/4 teaspoon salt
1/4 teaspoon crushed red pepper flakes
4-1/2 cups rigatoni or other large tube pasta, cooked and drained
2 cups shredded mozzarella cheese
1 cup shredded provolone cheese
Preheat oven to 400°. In a large saucepan, saute onion in oil until tender. Stir in tomatoes and tomato sauce. Bring to a boil. Reduce heat; cover and simmer 5 minutes. Stir in beef, salt and pepper flakes. Cover and simmer 5 minutes. Add pasta; toss to coat.
Transfer to a greased 13x9-in. baking dish. Sprinkle with cheeses. Bake, uncovered, 20-25 minutes or until cheese is melted.