I am looking to do a ground beef stuffed manicotti. Going to sautee the beef with the some veggies and cover the manicotti with a tomato based sauce. My question is do I need to boil the manicotti before I stuff it, or can I just let it cook in the oven with the tomato sauce and with moister from the meat? I know my mother makes lasagnia witthout precooking the noodles by adding some additional water and cooking it covered. Can I do something like that with manicotti?