Sichuan pepper

Short definition from Wiktionary

Noun

1. 1
   The outer pod of the tiny fruit of a number of species in the genus Zanthoxylum widely grown and consumed in Asia as a spice. Not closely related to black pepper or to chilli peppers.
2. 2
   Spice made from this pod.
3. 3
   A plant producing the pods, Zanthoxylum