Pu erh tea
Pu-erh teas come from Yunnan province and improve with age. Some are still drinkable at age 50. They come in green, black, white and tea. These are teas with medicinal qualities, highly prized by the connoisseur. Tea leaves are withered, then, still slightly moist, they're heaped into piles where a bacterium creates a reaction. The leaves are then dried loose or compressed into tea s or cakes.
