1.
Thoroughly mix together the sausage and ground beef by hand by repeatedly squeezing fistfulls out between your fingers until the mixture is uniform.
2.
In a large, deep, fry pan; heat oil on medium. Add onion and then salt. Sautè till onion is clear. Add garlic and sautè another minute. Add meat and turn up heat to med-high. As meat is cooking, continuously break it up and stir with a wooden spatula, giving you a nice crumble when meat is cooked through. IMPORTANT: DO NOT DRAIN THE JUICE! Add the next 10 ingredients and stir till boiling. Turn heat to low and cover with a splatter guard (not lid) and simmer for 1 hour, stirring up about every 15 minutes. Remove sauce from heat and let cool for at least 30 minutes before assembling lasagne.
3.
Preheat oven to 350 degrees F.
4.
Boil pasta in lightly salted and oiled water till "al dente" in a wide pot, so that you can turn the noodles on their sides. This allows pasta to cook evenly while greatly cutting down on sticking. While pasta is boiling, combine ricotta cheese, egg, 2/3 tub of Parmesan cheese, nutmeg and parsley in a bowl. Mix well with fork. Drain pasta.
5.
In a 9x13x2-inch pan, spoon enough sauce to just cover the bottom. Dredge pasta in cooled sauce and lay AROUND the pan on their edges (4 noodles), then layer the bottom (3 noodles). Spoon all of the ricotta mixture over the top of the flat noodles and spread even and smooth. Sprinkle a handfull of mozzarella on top. Make another layer of dredged noodles (3), and top with; 1/2 the sauce, then 1/2 the olives and then 1/2 the mozzarella. Repeat layer, pressing gently and evenly on top layer of pasta to compress and smooth out any high spots. Finally, top with remaining Parmesan. Pat down lightly.
6.
Cover with foil and bake for 45 minutes. Remove foil. Bake another 20 minutes, until cheese is just lightly browned in spots. Remove from oven. Let sit for 20 minutes before serving.
Alternate method
A lot of people prefer to use turkey instead of pork and beef. It'll work, but I recommend trying this out first as written.
Tip
By pulverizing the whole dried oregano you'll get a better flavor than buying it powdered already. I use a mortar and pestle for this.