Truffles

Truffles is a Canadian satirical science fiction film, written and directed by Kim Nguyen and released in 2008. Centred in a world in which global warming has turned the Hochelaga-Maisonneuve neighbourhood in Montreal into a mecca of wild truffles, the film stars Roy Dupuis and Céline Bonnier as Charles and Alice, the owners of a diner in the neighbourhood who are hired by a large corporation to find and harvest the delicacies, only to become embroiled in a nefarious body snatching plot.

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