Pu-erh tea

„The most famous variety of this category of tea is Pu-erh from Yunnan Province, named after the trading post for dark tea during imperial China.“

„Some more obvi­ous man­i­fes­ta­tions of cha qi are a heat­ing or cool­ing of the extrem­i­ties (eg, sweaty palms when drink­ing a ‘warm­ing’ tea like aged puerh or heav­ily roasted oolong), a flush­ing of the face, or a mea­sur­able change in mood. In a small group, tea can either lead to deep con­ver­sa­tion, giddy laugh­ter, or con­tem­pla­tive silence.“