A Cat in the Brain (1990) on Netflix

Dr. Lucio Fulci (more or less playing himself) is a former medical doctor-turned director of gory horror films. He wraps up shooting for the day on his latest film 'Touch of Death' with Brett Halsey playing the human monster/cannibal of women. Fulci leaves the Cincettia Studios for a local restaurant down the street. The young friendly waiter recognizes him and suggests his typical meal: a fillet of steak, or steak tarter. Fulci cannot look at the sample plates of meat without having flashbacks to the cannibalistic scene hed been filming earlier. Shaken, he leaves the restaurant without ordering a meal. The following day, while checking an effects shot from another movie, Fulci irritably snaps at a technician to get a plate of animal eyeballs out of his sight.