Preheat oven to 375F. Prepare lasagne according to directions on package; drain and set aside. In a saucepan, brown ground beef; drain fat. Add pasta sauce and water, bring to a boil. In a large bowl, blend egg, ricotta, mozzarella, 1/4 cup parmesan and parsley. Add salt and pepper to taste. Spread a layer of 1/4 sauce mixture in the bottom of a 13 inch x 9 inch x 2 inch pan. Arrange noodles lengthwise side by side, overlapping slightly to cover the sauce. Layer 1/2 cheese mixture, then 1/4 sauce mixture, top with noodles and repeat. Cover with the remaining sauce mixture and remaining 1/2 cup parmesan cheese. Cover with aluminum foil and bake for 45 minutes. Let stand for 5-10 minutes before serving. Serves 6-8.