Lunch around Brookfield Zoo?
It depends what you're looking for. My first suggestion would be The Village Pub on Cermak in North Riverside. They have good burgers, sandwiches, and a nice garbage salad. It is a pub so it may not be kid-friendly. Jedi's Garden on Harlem in North Riverside is pretty close and a pretty typical but above average Greek Diner. The Golden Wok on Maple in La Grange Park is a pretty good Chinese restaurant with a lunch buffet. Another option would be Irish Times along the tracks in Brookfield. Good, hearty stew highlights the pubbish menu. This is a bar as well.
re: Big Willi
Many thanks. Actually, the choice was taken out of my hands, and we went to some place called the Grapevine, which was OK (everyone else liked what they got better than I liked what I got). But I've printed out your list and intend to hit every place on it (we work at the Zoo).