Preheat oven to 350 F.

Rinse the broccoli and pat dry; trim and discard the stem ends. Split the stalks and chop the stems and florets.

Place the broccoli in the boiling water in a large saucepan. Cook, covered, over medium heat for 5 minutes. Remove from heat and drain well.

Sauté the onion in 1/4 cup butter in a large skillet for about 3 minutes or until golden brown. Add the chopped broccoli. Sauté for 1 minute longer, stirring constantly. Beat the eggs in a large bowl. Add the cheese, broccoli mixture, parsley, salt and pepper and mix to combine.

Line the inside of a 9-inch springform pan with 6 of the pastry sheets, overlapping the edges and brushing each sheet with melted butter.

Pour the broccoli mixture into the pan. Fold the overlapping edges of the pastry sheets over the top of the mixture.

Cut four 9-inch circles from the remaining 4 phyllo sheets with scissors. Brush each circle with melted butter, then layer over the top of the mixture. Slice through the pastry circles to make 8 wedges. Pour any remaining melted butter over the top.

Place the springform pan on a larger pan to catch the drippings. Bake at 350 F for 40 to 45 minutes or until the crust is puffy and golden brown. Remove to a wire rack to cool.