1. Cook onions in oil until soft.
2. Add crushed garlic and bell pepper. Cook 5 minutes over medium heat, uncovered or until bell pepper is soft.
3.Stir in tomato and anchovies. Cook until tomatoes are almost creamy, stirring occasionally.
4. Add capers, olives, oregano, drained tuna and cook a few minutes. Season. Stir in parsley.
5. Stir together with pasta pour into an oiled baking dish.
6. Sprinkle cheese mixed with crumbs.
7. dot top with pieces of butter
8. Bake in a pre-heated 350 oven for 30 minutes.