Prepare the sauce ahead of time by combining all the ingredients for it in a saucepan. Bring to a simmer over a medium heat and allow it to reduce until slightly thickened. Remove from the heat and set to one side. Heat the groundnut oil in a wok over a high heat until hot.
Stir-fry the onion, ginger and courgette for 2-3 minutes, then add the pork and continue to stir-fry over a slightly reduced heat for 2-3 minutes until just cooked. Add the sauce and reduce the heat; cook for a further 2-3 minutes. Spoon onto serving plates and garnish with the chive stalks.
For top tips on protecting you and your family when preparing raw meat and poultry, visit Food Safety in the Home and view the full Food safety at home video.