By Dave Cathey Food Editor dcathey@oklahoman.comUntil Monday, celebrity chef Rick Bayless hadn't walked the halls of Northwest Classen High School since 1971. He returned to the campus where he earned his diploma in just three years to speak with Angela Doss' culinary students and check out a new vegetable garden installed in the campus courtyard by members of OKC Beautiful on Saturday. Fall break and a relentless fire alarm test didn't stop students from convening in their classroom and kitchen lab to listen to the culinary superstar talk about the basics they should learn before they embark on a career behind the stove and what inspired him on his journey. For Bayless, the trip also entailed an appearance at the Tree to Table event put on by The Tree Bank Foundation of Oklahoma.Read more on NewsOK.com