Pu-erh tea

„Nèi fēi (内飞 or 內飛): A small ticket originally stuck on the tea cake but now usually embedded into the cake during pressing. It is usually used as proof, or a possible sign, to the authenticity of the tea. Some higher end pu'er cakes have more than one nèi fēi embedded in the cake. The ticket usually indicates the tea factory and brand.“

„The important thing of all this tea drinking and learning is not so much the drinking itself, but the critical reflection and evaluation that takes place simultaneously. Forget about what others tell you – what do you feel and think when you’re drinking this tea? How does it compare with what you have tried? How does it challenge what you already think you know?“