The best part about going to a show is often discussing the masterwork (or monstrosity) over grub and refreshing adult beverages. Trouble is, hardly anybody offers food late around here. Jimmy O'Neill's on Lee Road is a wonderful exception. Serving till midnight Thursday through Saturday and till 11 p.m. Sunday through Wednesday, O'Neill's offers everything gustatory, from a simple grilled cheese to a strip-steak dinner and salad with their to-die-for balsamic house dressing. Added treat: Chances are you'll be munching next to a tableful of performers from area theaters or members of the Cleveland Orchestra.