My absolute favorite fast casual option on State Street. Zas is the perfect lunch spot for a group because everything comes as a build your own option, so everyone can get what they want. They can make just about anything as long as the base is a pasta, pizza, salad or sandwich (so pretty much everything) and you get four ingredients before any up charges to customize your meal. I also love that they have a lot of healthy options and even have little pictures on the menu to help you pick out the good stuff. If you do go healthy though, don't skimp on the garlic bread. It's too good to be true.
My one complaint about Zas is that the menu is laid out in an undeniably confusing manner. The staff, however, think it's terribly obvious and will remind you of what a poor job you did filling out your circles.