Bring a large pot of water to the boil with a little salt and oil. Blanch the celery in the water for 30 seconds, drain and set aside.
Heat the oil in a wok or large frypan over high heat. Add the spring onion and ginger and stir fry until fragrant. Add the tofu and soy sauce; stir fry for 1 minute.
Add the celery and a pinch of salt and stir fry for 2-3 minutes. Sprinkle with the chicken stock powder and toss. Serve.