Somtum

Somtum, also released under the American title Muay Thai Giant, is a 2008 Thai martial arts film starring Nathan Jones as a tourist in Pattaya who is drugged, robbed and left penniless. Befriended by two young girls, one of whom is a muay Thai kickboxing champion, he is taken to their family restaurant where he is fed some spicy som tam. His adverse reaction leads to the destruction of the restaurant and he vows to raise the money to rebuild it.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.