Preheat oven to 350. Cook pasat until al dente, about 8 minutes; drain. In a large skillet brown onion and ground beef. Add spaghetti sauce and simmer 15 minutes.
Butter a 9x13 inch baking dish. Layer as follows- 1/2 ziti, ricotta cheese, 1/2 sauce mixture, remaining ziti, mozzarella cheese, and remaining sauce mixture. Top with grated three cheese. Bake 25-30 min.
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