Students in South Forsyth High School’s culinary arts program learned about more than just food last week. Organizers of this year’s Greek Festival, which Saints Raphael, Nicholas and Irene Greek Orthodox Church of Cumming holds each fall, visited the culinary students Tuesday.Several of the visitors were Greek “yiayias,” the term for “grandmother.” They taught the students about galaktabouriko, a pastry dish consisting of flaky filo dough baked around a light custard filling and topped with citrus syrup.