The Red Inn
L'auberge rouge (original)
A group of travelers, including a monk, stay in a lonely inn in the mountains. The host confesses the monk his habit of serving poisoned soup to the guests, to rob their possessions and to bury them in the backyard.
Starring Fernandel, Françoise Rosay, Jean-Roger Caussimon, Marie-Claire Olivia, Didier d'Yd, Julien Carette, Nane Germon, Yves Montand, Grégoire Aslan, Andrée Vialla
It's a crime and comedy movie, and has a rating of 7.2 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Spain.