I go to the food court in the basement of the 55 East Monroe building a lot but forgot about this favorite (till I had it again a few minutes ago). The grill section has a portobello mushroom sandwich. What they actually grill to order is a portobello mushroom plus about 6 thin slices of zuchini and yellow squash. This all goes on a burger bun with toppings of your choice, which can include grilled onions. Some tomato and ketchup and its a heck of a sandwich. Just thought those (like me) always looking for a new lunch option might like to know.