Two of us ( a mid-30s couple) are visiting Chicago for the first time. We live in big cities (New York and DC), and love food. We shall be there only for the weekend, and would like to try out the best (/most interesting) food places in Chicago (not at the really high end) that would take us to diverse neighborhoods, easily accessible by public transport. We do not care too much about ambience. We have 4 meals to plan for, and maybe some bites along the way. Maybe a BYOB place for one evening. Any suggestions would be greatly appreciated. Thanks!