Place flour on a pastry board and form a well in the middle.
Place eggs, sugar, oil and lemon zest in the well.
Stir with a fork and add grappa.
When the mix has firmed up start kneading until you get a smooth and elastic dough.
Wrap the dough in cling film and let it rest for about 30 m.
Roll out the dough with a rolling pin, until you get a very thin sheet.
Use a pastry cutter to cut strips of dough to the desired size.
Heat the oil to approximately 180° in a large pan.
Fry a few frappe at a time, turning them over from time to time.
As soon as they are golden, remove them from the oil with a slotted spoon, drain them and place them on a sheet of kitchen paper.
Sprinkle generously with icing sugar when cool.