Preparation Toss zucchini with 1/2 teaspoon salt in medium bowl. Let stand 30 minutes. Drain zucchini well; roll in kitchen towel and squeeze dry. Heat oil in heavy large skillet over medium-high heat. Add onion; sauté until beginning to brown, about 6 minutes. Add zucchini; sauté until beginning to brown, about 5 minutes. Mix in basil, parsley and garlic; add wine. Cover skillet; simmer 3 minutes. Uncover; stir until any liquid evaporates, about 2 minutes. Transfer zucchini mixture to large bowl and cool. Mix in both cheeses, then pine nuts. Season filling with salt and pepper. Mix in egg. Lightly oil 2 large baking sheets. Place 1 phyllo sheet on work surface with 1 short end parallel to edge of work surface (keep remaining phyllo covered with plastic wrap and damp kitchen towel.) Brush phyllo sheet lightly with butter; cut lengthwise into 3 equal strips, each about 4 inches wide. Place 1 generous tablespoon filling at bottom end of 1 strip. Fold 1 corner of phyllo over filling. Repeat folding down length of strip as for flag, brushing twice with butter and forming triangle. Place pastry on prepared baking sheet; brush with butter. Repeat with remaining phyllo sheets and filling. (Can be made 1 day ahead. Cover tightly with plastic and chill.) Preheat oven to 400°F. Brush pastries with egg white. Sprinkle pastries generously with sesame seeds. Bake until golden brown, about 25 minutes.
Preparation Toss zucchini with 1/2 teaspoon salt in medium bowl. Let stand 30 minutes. Drain zucchini well; roll in kitchen towel and squeeze dry. Heat oil in heavy large skillet over medium-high heat. Add onion; sauté until beginning to brown, about 6 minutes. Add zucchini; sauté until beginning to brown, about 5 minutes. Mix in basil, parsley and garlic; add wine. Cover skillet; simmer 3 minutes. Uncover; stir until any liquid evaporates, about 2 minutes. Transfer zucchini mixture to large bowl and cool. Mix in both cheeses, then pine nuts. Season filling with salt and pepper. Mix in egg. Lightly oil 2 large baking sheets. Place 1 phyllo sheet on work surface with 1 short end parallel to edge of work surface (keep remaining phyllo covered with plastic wrap and damp kitchen towel.) Brush phyllo sheet lightly with butter; cut lengthwise into 3 equal strips, each about 4 inches wide. Place 1 generous tablespoon filling at bottom end of 1 strip. Fold 1 corner of phyllo over filling. Repeat folding down length of strip as for flag, brushing twice with butter and forming triangle. Place pastry on prepared baking sheet; brush with butter. Repeat with remaining phyllo sheets and filling. (Can be made 1 day ahead. Cover tightly with plastic and chill.) Preheat oven to 400°F. Brush pastries with egg white. Sprinkle pastries generously with sesame seeds. Bake until golden brown, about 25 minutes.