Lei cha

Lei cha or ground tea is a traditional Southern Chinese tea-based beverage or gruel in Hakka cuisine.(擂; léi). The custom of lei cha began in the Three Kingdoms period or even in the Han dynasty. It is very common among Hakka people in Hakka regions of Taiwan. It was brought by Hakka people to Taiwan, Indonesia, Malaysia, and any locales with a substantial Hakka diaspora population. Besides Hakka lei cha, lei cha is also traditional among Hunanese people in northern Hunan. Lei cha is not the same as Taiwanese tea because there are always other ingredients. Ground tea consists of a mix of tea leaves and herbs that are ground together with various roasted nuts, seeds, grains, and flavorings.

Source: Wikipedia