Trim meat and cut into strips about 2" wide and 6" long. Combine remaining ingredients in bowl; pour over pork and marinate 2+ hours. Skewer pork with steel hangers and hang onto top rack of oven over shallow roasting pan containing a few inches of water.
Preheat oven to 425 for 10 minutes. Roast pork 20 minutes. With baster, coat with drippings every 5 minutes. Reduce heat to 325 and roast 5 minutes more. Slice each strip diagonally against the grain into 1/4" pieces. Serve cold. Dip with Chinese hot mustard and sesame seeds.