When we eat or drink something, we pay attention to its appearance and colour, of course, but once it is in our mouth, we consider the flavour, texture and aroma.
There are five flavours, or taste elements: sweet, salty, sour, bitter and a fifth, lesser known taste, called umami. Tea does not naturally have a salty flavour, but all the other taste elements are present. A tea can have several flavours. Just as an orange is both sweet and sour, a pu erh can be both sweet and umami.