The title could also refer to "Primavera", also called "Allegory of Spring", a Botticelli painting with which Hannibal (Mads Mikkelsen) was enamoured in his youth.
Following the pattern used in the previous seasons (to use as episode title terms relatives to a dish or a dish preparation - French cuisine in the first season and Japanese cuisine in the second) the third season use Italian nomenclature. Primavera refers to a way of preparing dishes in Italian cuisine. It is made of dishes originally made after the coming of Spring (Primavera) and usually involves a lot of fresh vegetables.