Mix together the black beans, garlic, ginger, sugar, soy sauce and oyster sauce in a bowl.
Heat a wok until just smoking. Add the vegetable oil and, when hot, stir-fry the scallops for 30 seconds, then add the spring onions, continuing to stir-fry until the scallops are just cooked through. Remove from the wok.
Reheat the wok and stir-fry the black bean mixture