Operational since 1996, Cos is a chain of restaurants based on the concept of a Parisian caf . It operates more than 100 restaurants in 16 states in the United States. Each location has an open-flame stone oven, which is used for preparing Cosi s signature flatbread. The restaurant s specialty menu includes a variety of salads, pizzas, soups, bagels, beverages and desserts. It serves meatball aurora, grilled chicken, tuna cheddar, Buffalo blue, Tuscan pesto chicken, turkey light, tandoori chicken and veggie muffaletta sandwiches. The restaurant s menu of salads include salad bruschetta, Shanghai chicken, Bombay chicken and Caesar varieties. The restaurant offers various beverages, such as smoothies, tea, coffee and lemonade. Cos provides catering services for breakfast and lunch meetings and evening receptions. The restaurant has several locations in Columbus, Ohio.