Meanwhile, heat a small wok or stir fry pan over medium heat. Add the sesame oil and once hot, add the baby bok choy stems, broccoli, and carrots; mix well. Cover the pan (to retain moisture), and stir fry for about 5 minutes or until tender. Turn off the heat, add the bok choy leaves and any extra ginger marinade. Stir until the leaves have wilted and everything is well combined.