Yerba maté is a traditional South American caffeine-rich drink made from the dried leaves of the *Ilex paraguariensis* plant. Unlike standard tea, maté is consumed as a social ritual. It is traditionally drunk from a hollowed-out gourd (also called a 'maté') through a metal straw known as a 'bombilla.' The bombilla has a filtered end to prevent the leaves from being sucked up. In a social circle, one person (the *cebador*) prepares the drink and passes it to each member of the group. Everyone drinks from the same gourd. It is considered a breach of etiquette to say 'thank you' (gracias) after receiving the maté unless you are finished and do not want any more.