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1
Preheat the oven to 400 degrees F. Butter the bottom and sides of two 12-by-18-inch baking sheets.
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2
In a food processor, combine the flour, salt, and baking powder. Add 1 cup cold water and 2/3 cup olive oil, and process until smooth. Remove the dough from the food processor, knead it into a ball with your hands, and wrap loosely in plastic film. Let it sit for 10 minutes or until ready to use.
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3
In a large saute pan, heat 1/2 cup of the oil over medium heat. Add the leeks, onion, and scallions, and saute until soft, about 5 minutes. Add the spinach, and saute, stirring until slightly soft, about 3 minutes.
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4
Using a slotted spoon, transfer the vegetables to a medium bowl, and add the parsley, mint (if using), dill, feta cheese, and salt and pepper. Taste, and adjust the seasonings if necessary.
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5
Divide the dough into 4 pieces. On a floured surface, roll out each piece of dough into a very thin rectangle. Brush each piece with the remaining oil, and spread 3/4 to 1 cup of filling along the length and center of each rectangle. Starting at one long side of each rectangle, roll the dough around itself to enclose the filling.
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6
Place the rolled dough seam-side down on the baking sheet, bending each piece to form a spiral. Brush with olive oil, and prick the surface here and there with a fork to allow steam to vent. Reduce the oven temperature to 375u00b0F and bake until golden, 35-40 minutes. Remove from the oven, and cool slightly, cut, and serve.
