1) Trim and slice the lamb neck fillet first and marinate in the cider vinegar, tamari, ginger and garlic, while you chop the rest of the vegetables. 2) Heat the oil in a wok over a high heat until smoking, then add the lamb and stir fry for a few minutes. 3) Add the rest of the ingredients and stir fry for about another 3 minutes more, you want them to have a little bite still. 4) Serve immediately.