Heat the wok over high heat and add the peanut oil. Add the garlic, ginger, chiles, black beans and rice wine if using and stir-fry for less than 1 minute. Add the mussels and stir-fry for less than 1 minute. Add the Chinese beer and the whites of the spring onions and cook until the mussels open, stirring occasionally. Discard any that do not open. Season the mussels with the light soy sauce. Sprinkle in the greens of the spring onions and the cilantro, serve immediately.