Preheat oven to 425 degrees F. In a bowl, combine the ground beef and lamb. In a separate bowl, beat the eggs, and stir in the milk and oats. Pour the mixture into the meats, and mix thoroughly. Add remaining ingredients except for clarified butter. Mix well, using your hands.
Shape the mixture into an oval loaf and place into a roasting pan. Drizzle with clarified butter and bake for at least 1 hour, or until done. Serve drizzled with Tomato Sauce or with the sauce on the side.
In a skillet, heat the butter or olive oil. Add the onion, green pepper, and bay leaf, and saute until the onion is translucent and limp, about 5 to 10 minutes. Add the remaining ingredients, except the tomato paste and parsley, breaking the tomatoes into small pieces as you add them. Simmer for 30 minutes, or until the sauce begins to thicken. Add the tomato paste, if using, and stir well. Cook 15 minutes. Stir in the parsley. Serve over the meat loaf.