Brown the beef
Bring a large pot of salted water to a boil. Cook the noodles according to the package directions. When complete, drain the noodles, and set aside. Meanwhile, heat a Dutch oven over medium heat. Add the bulk Italian sausage, ground beef and diced onion. Cook for 8 to 10 minutes or until the meat is no longer pink, breaking up the meat with a large spoon as it cooks to create gorgeous crumbles. Add the garlic, and cook for one minute, until the mixture is fragrant.

Make the meat sauce
Drain the mixture in the Dutch oven. Then, add the remaining sauce ingredients: crushed tomatoes, tomato paste, water, sugar, 3 tablespoons parsley, basil, fennel, 1/2 teaspoon salt and coarsely ground pepper. Bring the mixture to a boil. Reduce the heat to a simmer. Cook, uncovered, for 30 minutes, stirring occasionally.

Prepare the cheese filling
In a small bowl, whisk together the egg, ricotta cheese, and remaining 1/4 cup parsley and 1/4 teaspoon salt. If you haven't already, grate the mozzarella and Parmesan cheeses.

Layer the lasagna ingredients
Preheat the oven to 375°. Spoon 2 cups meat sauce into an ungreased 13x9-inch baking dish, spreading it out to cover the entire dish. Layer three noodles onto the sauce. Add one-third of the ricotta mixture, spreading it over the noodles with a rubber spatula or an icing spatula. Sprinkle with 1 cup mozzarella cheese and 2 tablespoons Parmesan cheese. Repeat the layers twice, finishing with remaining meat sauce and cheeses. The dish will be very full by the time you get to the top!

Bake the lasagna
Cover the baking dish, and bake for 25 minutes. Remove the cover, and cook for an additional 25 minutes, until the sauce is bubbling around the edges and the cheese is fully melted. Let the lasagna stand for 15 minutes before slicing and serving.