An Oak Park bakery fills the air with a wonderful, erev Shabbat aroma. GLENN TRIEST Photographer Opposite page: Top left: When most are thinking about turning in for the evening, customers line up at Bagels Plus for freshly baked challahs. Lower left: A customer enters Bagels Plus late Thursday night. Lower right:Bagels Plus now sells some 750 challahs for Shabbat. This page: Above: The dough is prepared. Right: Mendy and Dovid Cohen line up for challahs. 9/26 1997 87