You need to use a deep lasagna pan for this recipe. If you don't have one then use a regular 13x9 pan but may need to only do 3 layers. You can put the fourth layer in a loaf pan for leftovers.
Put the ground beef, chopped up sausage and onion in a dutch oven. Brown on med high heat. Once the onion is softened add the garlic. Stir often to break up the big meat chunks. Add the canned tomatoes, paste, basil, water and salt. Bring to a boil and then turn down to low simmer for 1.5 hours. Cover and stir often. Taste and add salt if needed.
In a medium bowl mix ricotta cheese, eggs, parsley and parmesan cheese mix.
Once sauce is finished, preheat oven to 375. In a lasagna pan or 13x9 pan, ladle 1-2 cups of sauce. Spread evenly and add a layer of 6 lasagna noodles. Top with 1/4th of the ricotta mix and a layer of mozzarella cheese. Top with sauce and start another layer of noodles, ricotta, cheese and sauce, You should have 4 layers of noodles. On the last layer put the sauce over the ricotta and then top with cheese.
Cover with foil and bake for 45 minutes. Remove the foil and bake 15-20 minutes longer. Remove from oven and let sit 15 -20 minutes prior to cutting and serving.