Remove the meat from the duck and finely slice it, discarding the bones. Finely chop the spring onions, celery and chilli.
Heat a wok or fry pan, add the oil and heat. Add the ginger and garlic and cook until golden to flavour the oil, then remove and discard. Add the celery, chilli and half the spring onions and stir-fry for 2 minutes. Add the duck and stir-fry for 1 minute.