As a grad student, I'm always looking for recipes that are quick, easy and relatively cheap, but taste great at the same time! I adapted this ziti dish from a number of recipes online after none of them were precisely what I wanted. I hope that you enjoy it too. The cheese is simply what I tend to keep in the fridge and therefore what I had to put the recipe together. It was a good combination, but you can substitute whatever you would like for it. Equally, you can leave out the ground beef if you'd like it to be vegetarian. I would perhaps substitute some mushrooms, spinach, etc. for it.