Subway: Blue, Brown, Green, Orange, Pink, Purple (rush hrs) to Clark/Lake(312) 578-1478 mburgerchicago.com41.878114 -87.629798 Thompson Center, 100 W Randolph (at Clark St) Loop, Chicago
Mon–Fri 10am–5pm (closed Sat, Sun)Average main course: $4
The latest M Burger is in the Thompson Center’s subterranean food court, which gives it a Sbarro-like quality. This is not a great thing. However, as if to make up for the lack of ambience, this location offers a couple of things the others don’t: 1) A daily “Shake Break,” where shakes are half price from 2pm–close; 2) A special off-menu burger called the Old Fashioned, which gets you a burger with lettuce, tomato, onion, ketchup and mayo (a classic combination that, surprisingly, has been unavailable at M Burger until now). Of course, the normal M Burger fare (cheeseburgers, fries, an unexpectedly good side salad) is here, too, and that alone makes up for the location.