The trick to making delectable dumplings--whether using long-grain or round glutinous rice--lies in carefully adjusting the water-to-rice ratio according to humidity levels. If it's too dry out, the dumplings will crack open.
湯圓好吃的訣竅在於，長糯米、圓糯米要看天氣濕度掌握比例，太乾，湯圓會裂開；太濕，咬起來又不夠 Q。