Making a Spinach Pie

INGREDIENTS:
FOR THE DAUGH:
1 KG FLOUR ALL USE
PINCH OF SALT
2 CUPS OF WATER
1 CUP OF OIL
3 TBS OF VINAGRE
FOR THE FILLNG:
1 KG WASHED SPINACH
3 ONIONS GREEN
OILVE OIL
500 GR FETA(WHITE CHEESE)
SALT
FOR DUSTING:
CORN FLOUR
FOR OINTMENT:
VEGETABLE BUTTER
BAKE THE PIE FOR 45'IN THE OVEN PREHOT AT A HIGH TEMPERATURE,22OC