This Italian version of cheesecake tastes much lighter than its cream-cheese counterpart.
Preheat oven to 350 degrees. Butter a 9-inch springform pan, and dust with breadcrumbs, tapping out excess. In a small bowl, stir together raisins, flour, and zests; set aside.
With an electric mixer, beat ricotta, sugar, and salt until smooth. Add eggs one at a time, beating well after each addition. Beat in vanilla. With mixer on low speed, add flour mixture, and beat just until smooth (do not overmix).
Pour mixture into prepared pan; place on a rimmed baking sheet. Bake until cake is browned and jiggles only slightly when shaken, 60 to 70 minutes. Cool completely in pan; unmold to serve. Serve chilled or at room temperature.
The cake can be refrigerated for up to three days; leave in pan, cool completely, and cover with plastic wrap. Unmold just before serving.