Preheat oven 200 deg.
Crumb feta in a bowl and add eggs, combine well.
Remove 1 sheet of pastry and brush with melted butter.
Place the second sheet on top and brush with butter, repeat with the third sheet.
Cut pastry into 4 lengthwise (each of these 4 strips makes 1 triangle).
Place 2 tsp of cheese mixture onto the edge of each strip.
Fold into a triangle and keep folding maintaining the triangle shape.
Place on buttered (or paper lined) oven tray and bake at 200 deg for 20 minutes.