Cosi - Lexington, Lexington

An open-flame hearth is at the heart of Cosi's kitchen space, giving sandwiches and pizzas their toasty crunch. But there's a lot more to the menu than what happens under the flame. The T.B.M. sandwich piles tomatoes, basil, and fresh mozzarella inside warm flatbread and the tandoori chicken sandwich brightens up grilled chicken breast with red peppers. Even salads are hearty meals here, with choices such as the cobb mixing greens with grilled chicken breast, bacon, and gorgonzola in a sherry-shallot vinaigrette. The crown on top of any meal here is undoubtedly the s'mores, in which two to four diners roast their own marshmallows over a tabletop fire pit, then sandwich the sugar cloud with chocolate and graham crackers before dragging their sleeping bags into the kitchen for a night's rest.