Bring a large pot of lightly salted water to a boil. Cook pasta in boiling water for 8 to 10 minutes, or until al dente; drain.
Meanwhile, prepare the sauce. In a large pot or Dutch oven, cook ground beef and sausage over medium heat until brown; drain. Stir in tomato puree, tomato paste, sugar, 1 teaspoon salt, garlic, and 1 1/2 tablespoons parsley. Reduce heat, and simmer uncovered for 30 minutes.
In a bowl, stir together cottage cheese, eggs, pepper, Parmesan, 1 1/2 tablespoons parsley, and 1/2 teaspoon salt until blended.
Preheat oven to 350 degrees F (175 degrees C). In a 9x13 inch baking dish, layer a third each of the noodles, sliced mozzarella, cottage cheese mixture, and meat sauce. Repeat layers twice.
Bake lasagna in the preheated oven for 1 hour, or until hot and bubbly. Let stand 15 minutes before serving.