Pasticceria il Boccione
For 200 years, Pasticceria il Boccione has been baking kosher treats for Rome’s Jewish community. Its repertoire (and customer service) is limited but disregarded by its clientele, especially the almond macaroons and cinnamon almond biscotti, over-stuffed crostata (which the New York Times calls the best in Rome), and signature pizza ebraica. It's not pizza in the traditional sense, but rather like a brick of fruit cake with almonds, pine nuts, raisins, and candied fruit.
If you can’t get there by late morning, it’s best to call ahead and reserve what you want.