Begin by gathering all the required ingredients to ensure a smooth cooking process.

In a Dutch oven over medium heat, brown the Italian sausage, ground beef, minced onion, and crushed garlic until they are well-cooked and flavorful.

Stir in the crushed tomatoes, tomato sauce, tomato paste, and water. Season the mixture with granulated sugar, 2 tablespoons of freshly chopped parsley, dried basil leaves, 1 teaspoon of salt, Italian seasoning, fennel seeds, and ground black pepper. Allow the sauce to simmer, covered, for approximately 1 ½ hours, remembering to stir occasionally.

In a large pot, bring lightly salted water to a boil. Cook the lasagna noodles in the boiling water for 8 to 10 minutes. Drain the noodles and rinse them with cold water.

In a mixing bowl, combine the ricotta cheese with the egg, the remaining 2 tablespoons of freshly chopped parsley, and ½ teaspoon of salt.

To assemble the lasagna, spread 1 ½ cups of the meat sauce in the bottom of a 9x13-inch baking dish. Arrange 6 noodles lengthwise over the meat sauce. Spread half of the ricotta cheese mixture on top. Layer one-third of the mozzarella cheese slices and then spoon 1 ½ cups of meat sauce over the mozzarella. Sprinkle ¼ cup of Parmesan cheese on top.

Repeat the layers and finish with the remaining mozzarella and Parmesan cheese. To prevent sticking, either spray the foil with cooking spray or make sure it does not touch the cheese.

Bake the lasagna in the preheated oven for 25 minutes. Remove the foil and bake for an additional 25 minutes.

Allow the lasagna to rest for 15 minutes before serving. This resting period will help the flavors meld together and make slicing easier.

Indulge in the ultimate delight of this homemade lasagna. The savory blend of Italian sausage, ground beef, and layers of cheese will transport your taste buds to a world of culinary bliss. Enjoy this comforting dish with loved ones and savor every bite of this unique and unforgettable lasagna experience.