Pu-erh tea

„The leaves are then dry pan-fried using a large wok in a process called "kill green" (殺青; pinyin: shā qīng), which arrests most enzyme activity in the leaf and prevents full oxidation. After pan-frying, the leaves are rolled, rubbed, and shaped into strands through several steps to lightly bruise the tea and then left to dry in the sun.“

„ku se; 苦涩 - Bitter and astringent. The nature of new raw Puer is a little astringent and bitter, followed by a sweet aftertaste. However, a bitterness with no sweet aftertaste is not typical of Puer and an astringency which is not comfortable would not be considered good tea. “