Add the ginger and garlic and cook for 1 minute. Add the star anise, sugar and tangerine peel, then stir in the soy sauce, tangerine juice and cornflour. Simmer until thickened. Add the beef and stir.
Chinese black beans have been salted, fermented and dried. Chun pei is dried, aged tangerine peel; you will need one piece from a whole tangerine. These ingredients are sold in the Chinese section ...