For the filling: Saute onions, add mince, a grated potato, parsley salt and pepper and cook until mince has browned.
For the liquid mixture (to keep your boreks moist) add an egg, yoghurt and a splash of oil and give it a good mix
Open out filo pastry sheets, I usually use two at a time if they are thin.
Add your filling and about 4 tbsp of the liquid mixture.
Roll up the filo pastry, and role round into a spiral shape:
Egg wash and decorate with sesame seeds/black seeds or leave plain if you are sending them off to school for the kids packed lunches. Bake in the oven for about 35 mins at 200 degrees, until golden brown.