Bring a large pot of lightly salted water to a boil. Add ziti pasta, and cook until al dente, about 8 minutes; drain. In a large skillet, brown onion and ground vegetarian beef over medium heat. Add spaghetti sauce, and simmer 15 minutes. Preheat the oven to 350 degrees F (175 degrees C). Butter a 9x13 inch baking dish. Layer as follows: 1/2 of the ziti, Provolone cheese, sour cream, 1/2 sauce mixture, remaining ziti, mozzarella cheese and remaining sauce mixture with celery. Top with grated Parmesan cheese. Bake for 30 minutes in the preheated oven, or until cheeses are melted.Enjoy!
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