I'm looking for a short story where the narrator has to travel a long way, probably for work, and has to stop overnight in a village he doesn't know. He is stopped by the police for a trivial reason, and detained at the station overnight. He notes several intriguing details, including the shape of the teeth of everyone he meets, which are sharp. The next morning he was treated to a good meal, and taken from his cell to appear before the judge. He is taken to a strange, empty room with bare walls. The door closes behind him, he doesn't understand, and notices that the walls are starting to heat up. It's an oven, the inhabitants are cooking it to eat him. He remembers in his head the teeth of the inhabitants, the banner in the street "big barbecue tomorrow", and screams.
Like I said, I've read it in an "Alfred Hitchcock's Tales...", but I am unable to find it, even after a long search. If you have an idea of its name or author...