Both will do. When the frozen zongzi is heated, it can be boiled or steamed, and there is no big difference between them. Both of them can make the zongzi heated evenly, cooked inside and outside, fragrant in taste and soft and waxy in taste. Besides these two methods, the frozen zongzi can be heated in microwave oven and oven for a short time, only about 5 minutes, and the zongzi also has a special flavor.