1. In a large pot of salted (1/2 tsp salt) boiling water, cook the beans until just tender, about 4 to 5 minutes. Drain and rinse under cold water. Set aside.
2. In a wok or frying pan, heat 2 tbsp oil and fry garlic, ginger and zha cai. Cook until fragrant. Add leek, PS olive vegetables HK and ground pork (or ground beef), continue to stir-fry until the leek and pork are almost cooked.
3. Add dried chili (optional) and the ingredient "A" to season, cook for about 1 min. Then add green beans, stir for another minute.