Practice: buy fish when letting the stall owner slaughtered, go home and clean it. Black beans cleaned, black beans, white onion, ginger, garlic together chopped; fish flat in a dish, sprinkle a thin layer of salt; chopped black beans ginger garlic paste spread on top of the fish; boil a pot of water, when the water boils, put the fish into the pot, high heat steaming for 8 minutes, turn off the fire do not open the lid, continue to virtual steam for 5 minutes; open the lid of the pot, the fish out; steam fish in the dish of the juice poured into the pot, add soy sauce and oil; low heat to boil; while still warm Pour over the top of the fish and sprinkle with chopped green onion to serve.