- Add oil to heavy bottomed pan for sauce. Break tomatoes up with hands. Discard the small ends that don't break up. It's important here to use a high quality brand that specifically says San Marzano, so you don't end up with a lot of pulp.  
- Cook on medium for thirty minutes.  
- Use a blender or immersion blender to make the sauce smooth.  
- If using Italian sausage, fork, and bake for twenty minutes at 400 degrees.  
- Add meatballs and sausage into sauce, while pasta is cooking. 
- Cook pasta according to directions.  
- Drain pasta, arrange in baking dish, with sliced meatballs and or sliced sausage, ricotta cheese. Sprinkle with parmesan or pecorino romano. Top with mozzarella.  
- Bake at 375 degrees F. until cheese is completely melted, about twenty minutes.