In a medium skillet over medium heat, cook the sesame seeds about 5 minutes, stirring frequently, until lightly browned. Remove from heat, and set aside. In another skillet, heat the oil over medium high heat. Stir in snow peas, onions, ginger and mushrooms; cook up to 5 minutes until fork tender. Transfer snow peas and vegetables in the skillet into a medium to large glass serving bowl. Toss with sesame seeds and teriyaki sauce, and serve warm. Serves 4.