Finely chop the black beans then, in a small glass bowl, mix with the chopped ginger & garlic, soy sauce and rice wine.
Line a bamboo steamer with a banana leaf or baking paper.
Wash the scallops, then place these tightly next to each other in the steamer. Pour a spoonful of the sauce on top of each scallop. Cover with the leaf/paper to create a parcel & put the lid on.
In a wok, add 5 cm of water, bring to a boil. When the water is boiling, put in the bamboo steamer, making sure it doesn't touch the water. Steam over high heat for 10 minutes or so.
Carefully take the steamer out of the wok, put it on a plate. Unwrap the parcel and serve.