Heat a wok or large frying pan over medium-high heat. Add 1 tablespoon sunflower oil, 1/2 onion, sliced and 1/2 green pepper, sliced and stir fry for 1 minute. Add the prepared black bean mix and stir fry for 30 seconds. Add 1/4 teaspoon sea salt, 1/4 teaspoon MSG, pinch white pepper, 1 teaspoon dark soy sauce and 200 millilitres light chicken stock. Add 1 portion chicken for Chinese takeaway style stir fry dishes, mix well, bring to the boil and simmer for 2 minutes until the sauce reduces slightly. Add 1 tablespoon oyster sauce.