In a bowl, mix together spinach, feta cheese, onion, parsley, seasonings, and 2 beaten eggs.
In a separate bowl, whisk together remaining egg and water; set aside.
Unfold pastry sheets on a lightly floured surface.
Roll pasty sheet into a 12 inch square.
Cut the pastry sheet into sixteen 3 inch squares with a pizza cutter.
Place one tablespoon spinach mixture in the center of each square.
Fold squares over filling to form triangles.
Brush edges with egg mixture; crimp edges with a fork to seal.
Place on a lightly greased baking sheet.
Brush tops with remaining egg mixture.
Bake at 400 degrees for 20 minutes, or until golden.
Serve warm or at room temp.