Cook onions in oil in large skillet over medium heat. Stir in rice, all but 1/4 cup tomato, salt and pepper. Cook 2-3 minutes. Press rice into a greased 9" deep-dish pie plate. Spread spinach over rice mixture, top with crawfish, then with Swiss and mozzarella cheeses. Combine eggs, cream, seasoning, nutmeg and cayenne in a small bowl. Pour over cheese layer. Sprinkle with reserved tomato, then with Parmesan cheese. Bake at 350 degrees for 35-40 minutes or until firm and golden brown. Serves 6.