Silent auction prizes include signed copies of Chiang's latest book.Famed San Francisco restaurant owner, cooking teacher, and consultant Cecilia Chiang is being honored on her 90th birthday Friday with a banquet at Yank Sing Rincon Center (101 Spear at Mission). The eight-course menu was created by Chiang, whose Mandarin restaurant influenced generations of U.S. restaurateurs. Students Chiang has taught include Julia Child, James Beard, Alice Waters, and Danny Kaye. Since retiring from t