In a 6-quart pot, saute onion and garlic in liquid butter buds. Add undrained tomatoes, tomato paste, 1 1/2 cups water, 2 tablespoons parsley, sugar, oregano, basil and pepper. Mix well. Mash tomatoes. Simmer covered but stirring occasionally for 1 hour.
Preheat oven to 350ºF. Cook ziti as package directs. Make cheese layer: In large bowl, combine ricotta, 1 cup mozzarella, 1/4 cup parmesan, egg beaters, parsley, and pepper. Beat with wooden spoon until blended.
Spoon a little sauce into a 5-quart casserole dish (or 2 9-inch square dishes) that have been sprayed with cooking spray. Layer 1/3 ziti, cheese mixture, and remaining sauce. Sprinkle part of the remaining mozzarella on top. Repeat layers 2 times, ending with mozzarella and 1/4 cup parmesan. Bake uncovered 45 minutes.