In a small bowl, beat egg, water and mustard; set aside. In another bowl, combine the cheese, onion, parsley, caraway seeds and garlic salt.
Unfold pastry sheet; brush with egg mixture. Sprinkle cheese mixture lengthwise over half of the pastry. Fold pastry over filling; press edges to seal. Brush top with remaining egg mixture. Cut widthwise into 1/2-in. strips; twist each strip several times.
Place 1 in. apart on greased baking sheets, pressing ends down. Bake at 350° for 15-20 minutes or until golden brown. Serve warm. Yield: about 1-1/2 dozen.