Father's day in Italy is celebrated on March 19th, on Saint Joseph's day. For the occasion, all over the country all pastry shops get filled with bignè or zeppole, fritters filled with lemon pastry cream. In this detailed recipe are also some tips to bake them, if you don't like the idea of deep frying.
Not traditional but as tasty: try to fill the bignè with hazelnut custard, ganache or simple whipped cream.