Yerba maté (Ilex paraguariensis) is made from the leaves of a holly tree that grows in South America. It's brewed like tea, but it isn't tea. People there drink it all day: hot, cold, or the traditional way from a gourd with a metal straw (bombilla).
Above all, maté is shared. One gourd goes around the group, and everyone gets a turn. Whether it's your first sip or you grew up with it, matécito is for you.