Combine uncooked rice & 1 1/2 c. Cold water. Let stand 2 hours. Drain rice & place on paper towels to dry. Combine mushrooms & 1/2 c. Hot water; let stand 15 min. Remove & discard mushroom stems; set aside caps. Trim excess fat from pork. With knife blade process pork 1 min. Or until finely chopped. Add reserved mushrooms, egg & remaining ingredients; process 45 sec. Or until well blended. Shape pork mixture into 16 (1 in. ) Balls. Roll each ball in reserved rice. Arrange balls in a 10 x 6 x 2 in. Baking pan; place dish on a rack in a roasting pan. Pour water in roasting pan to the depth of 1 in. Bring to a boil. Cover roasting pan. Reduce heat to medium & steam 20 min. Serve immediately.