Bring a large pot of lightly salted water to a boil. Cook lasagna noodles in boiling water for 8 to 10 minutes. Drain noodles, and rinse with cold water. In a mixing bowl, combine ricotta cheese with egg, a few leaves of basil, and 1/2 teaspoon salt.
To assemble, spread a thin layer of meat sauce in the bottom of a 9×13-inch baking dish to prevent sticking. Arrange 6 noodles lengthwise over meat sauce. Spread with 1/2 of the ricotta cheese mixture. Top with 1/3 of the mozzarella cheese slices. Spoon 1 1/2 cups meat sauce over mozzarella, and sprinkle with 1/4 cup Parmesan cheese. Repeat layers, and top with remaining mozzarella and Parmesan cheese. Cover with foil.