Heat a wok or large frying pan until really hot, add a tablespoon of oil and stir-fry the chicken for 4-5 minutes until golden. When cooked remove to a plate. Reheat the wok or pan and add the remaining oil. Add in the garlic, vegetables and ginger and stir-fry for a couple of minutes until they just begin to soften. Add back in the chicken, the soy sauce, a splash of water, sesame oil and some black pepper. Continue to stir-fry for a couple of minutes. Taste for seasoning. You may need to add a little salt. Sprinkle over the coriander and serve with noodles or rice.