Scrub mussels. Remove their beards. Rinse and drain. Cook in a wok with 1½ cups water, covered, until the shells open. This will only take a few minutes. Immediately remove mussels from wok with a slotted spoon. Throw away any that haven't opened. Drain and clean wok.
Heat 2-3 tbsp oil in wok and stir fry spring onion, ginger slivers, garlic, sliced chillies, onion and capsicum for 3 minutes. Add mussels and stir fry for 2 minutes. Add shao xing wine, sugar, oyster sauce. sesame oil and chicken stock. Stir fry for 3 minutes. Then add vinegar and coriander and serve.
Recipe by Craig Cooks at https://craigcooks.com.au/stir-fried-mussels-2/