In a large mixing bowl, mix together the chicken, egg, tapioca flour and all the seasoning ingredients with spring onions and corianders except the sticky rice, then form into 1/2 inch balls in diameter.
Surround each ball with a layer of sticky rice. Line the steamer layer with lettuce, cabbage or other seasonal green leaves, rub with the cooking oil thoroughly. Place the balls on the leaves, spacing well apart about 1-2 inches to prevent them from sticking to each other. Steam over vigorously boiling water for about 20 minutes until cooked. Remove.