In a 13 x 9-inch (33 x 23 cm) baking dish, spread out 1 cup (250 ml) of the sauce. Cover with one row of noodles. Top with half of the spinach filling and cover with 1 cup (250 ml) of sauce. Sprinkle with ½ cup (50 g) of caciocavallo. Cover with a row of noodles. Top with 2 cups (500 ml) of sauce. Sprinkle with ½ cup (50 g) of caciocavallo. Cover with a row of noodles. Cover with the remaining spinach filling and 1 cup (250 ml) of sauce. Sprinkle with ½ cup (50 g) of caciocavallo. Cover with a last row of noodles and remaining sauce. Cover with the Parmesan and remaining caciocavallo. Freeze at this point, if desired. Place the baking dish on a baking sheet.