Heat the oven to 180˚C.
In a bowl, mix the melted ghee and melted butter. Using a pastry brush, cover a pastry sheet completely with melted butter and margarine. Cover with another sheet, then brush and repeat until you use up all of the pastry. Cut the pastry into 16 x 16 cm squares.
Put a tablespoon of Nutella® in the centre of each square and fold it into a triangle. Bake in a shallow pan until the pastry is golden.
Remove from the oven and let it cool completely before handling because the filling will be very hot. Sprinkle with the ground pistachio and sugar syrup before serving.