Von Harris wanted to cook his Great-Grandma Shortstop’s greens for his high school classmates and teachers. It was one of a series of lunches that served as evaluations for an advanced cooking class called Chef and Restaurant Cooking. For his prep list, the 15-year-old Hinsdale South sophomore requested collard, mustard, and turnip greens, along with smoked turkey wings. But the next day, his teacher instead produced fresh, raw wings and a bottle of liquid smoke.