Like every Saturday, Rosa Priore prepares the ragù for Sunday while her husband Peppino paces nervously around the kitchen, arguing about every little thing. When Sunday arrives, the entire Priore family gathers around the table and Mrs. Priore wears a beautiful blue scarf given to her by her neighbor, the thoughtful accountant Ianniello, who lavishes compliments on Donna Rosa and her cooking. After yet another compliment, Peppino explodes and accuses them in no uncertain terms of having an affair. Sunday is ruined, but will the family be able to pull themselves together on Monday?
