Gunpowder tea (Chinese: 珠茶; pinyin: zhū chá; lit. ‘pearl tea’; pronounced [ʈʂú ʈʂʰǎ]) is a form of tea in which each leaf has been individually rolled into a small pellet. Its English name comes either from some resemblance of the pellets to gunpowder, or from a phrase in Chinese that phonetically resembles the word “gunpowder”. This rolling method of shaping tea is most often applied either to dried green tea (the most commonly encountered variety outside China) or to oolong tea.

Gunpowder tea, Wikipedia