Don't sprinkle it directly on the steamed buns! Then the buns are affected! You take a plate or box and put the buns in it. Also take a locket, a bottle cap will do, or the lid of any box will do. Catch a little bit of water

and put the steamed buns on the plate together in the microwave. Hot time is not too long. General supermarkets sell the kind of small buns, very small kind, 4 1 minute on the line.