Pour the flour, the baking powder (sieved), the orange peel, the vanilla and the pinch of salt into a bowl;
In another bowl, whisk the ricotta, egg and sugar;
Pour the ricotta mixture into the bowl with the dry ingredients. Knead the mixture quickly and if necessary add more flour until the dough becomes firm, it must be like that of gnocchi, soft but not sticky;
When the dough is compact and malleable, place it on a lightly floured pastry board, break off pieces of about 8 grams each and form into small loaves;
Divide the loaves in half and form the bows. In a tall pan heat the oil, it must be hot;
Fry the zeppole in plenty of oil and no more than 3 at a time otherwise the oil temperature will drop;
Turn them often with a slotted spoon;
Drain the zeppole and dry on absorbent paper. Pour the granulated sugar into a plate and coat them in the sugar while still hot;
Serve the sweet orange ricotta zeppoline hot or warm and… enjoy your meal!