A really great place to go for lunch on a budget is Autogrill. Some of you may know that it's a chain of cafe/restaurants that can be found all over Italy along highways. Autogrill is far from the usual restaurants by the road. They serve fresh, great food. In Rome, it's located in the center and has a cafe, a self-service and a sitting part. You can buy anything from pastry and pizza to Italian risottos, pasta, cooked or grilled vegetables, meet, fish, fresh salads and fruit, cakes. And all of it is made in front of you.