Preheat oven to 350 degrees F (175 degrees C). Grease a 9x13 inch baking dish. Bring a large pot of lightly salted water to a boil. Add spaghetti and cook for 8 to 10 minutes or until al dente; drain and stir in tomato sauce, tomato paste, cinnamon, oil, salt and pepper. Transfer to prepared dish. Bake in preheated oven for 1 hour, or until top is crunchy.