Start the sauce first, so it can simmer while you do everything else. Get the oil heating in a large pot over medium heat. Once its hot, add the beef and sausage and cook until it is browned throughout. Drain any excess grease, then stir in the onions and garlic to the pan. Cook, stirring often, until the onion has softened up a bit, about 3-5 minutes. Then pour in the canned tomatoes, seasonings and sugar. Lower the heat to med-low and let this simmer until your ready to assemble the lasagna.

Preheat the oven to 350°F. Grease a 9x13" baking pan and set it aside. In a large bowl, whisk together the ricotta cheese, eggs, parmesan and seasonings. Set this aside. In a large pot of boiling salted water, cook the lasagna noodles until al dente. Drain them and let them cool enough to handle.

Once ready to assemble, spread 1/4 of the sauce into the bottom of the pan. Lay out 5 of the lasagna noodles. Spread 1/2 of the ricotta mixture over the noodles, then half the sliced mozzarella. Spread 1/4 of the sauce over that, then repeat with another layer.