Mu Err soak mushrooms in hot water and let them swell. Wash, dry, core and cut the peppers into bite-sized pieces. Peel the carrot and cut into thin, bite-sized segments. Clean the spring onions, cut into oblong, oblique pieces. Clean, wash and slice the leek. Wash the cucumber, cut into short strips with the skin on. Drain the bamboo shoots. Remove the stalk from the swollen mushrooms and cut into small pieces.