According to the article, producers pick leaves at different stages of maturity, then dry them and sometimes ferment them. The dried leaves may be crushed like loose-leaf tea or ground finely in a way similar to matcha. In Southeast Asia, the piece notes, kratom has long been a social drink. It also describes kratom being served as a tea in some kava bars, much like kava itself.
Barista Magazine Feature Places Kratom Tea Alongside Kava and Coffee Culture