1. Soak Cochayuyo seaweed, blanch in salted water until soft, drain, rinse in cold water and cut into sections.
2. De-string green beans, cut into sections; thinly slice red chilli pepper; mince garlic.
3. Add oil in heated wok, sauté minced garlic and pickled leaf mustard, then drizzle in a little water to release the ingredients' flavour, drizzle in Shaoxing wine, toss green beans and Cochayuyo seaweed, sauté.
4. Season with salt and sugar, add a little stock or water, turn to low heat, add a little oyster sauce, when liquid boils up, add dark soy sauce, braise with lid covered until liquid evaporates.
5. When you smell the fragrance of pickled leaf mustard and the sauce is absorbed by green beans, add red chilli pepper slices, mix well, thicken sauce with corn starch mixture and serve.