09/20/06 Ralph Barrera/AMERICAN-STATESMAN; Carol Johnston is the only child of Luby’s co-founder Charles and Gertrude Johnston and recently made a trip to Austin to promote her new book on the history of the cafeteria. Johnston pushes her tray along the food line as she makes her choices for dinner at the Luby’s on Steck Ave. in north Austin. (Crider story)