Florentine Beef & Cheese-Stuffed Shells

box (340 g) jumbo pasta shells (approx. 44 shells)

lean or extra lean ground beef sirloin

medium onion, finely chopped

large garlic cloves, minced

Italian seasoning

pkg. (454 g) light ricotta cheese

pkg. (300 g) frozen chopped spinach, thawed and squeezed dry

shredded part-skim mozzarella cheese

pepper

pasta sauce

grated Parmesan cheese