Lakanto

In the remote mountain highlands of Asia, a group of Buddhist monks called the Luohan achieved enlightenment through meditation, prayer and pure living. On the slopes of a primeval forest, the monks discovered and cultivated a rare fruit prized for its sweetness. This scared fruit was named Monk Fruit, or Luohan Guo, after its devoted caretakers and was used in elixirs to increase chi, or life energy.
  
Monk Fruit was used for centuries in eastern traditional herbalism to increase chi and well-being, earning it the nickname "The Immortals' Fruit".