Divide pastry in half. On a lightly floured surface, roll each half into a 9-in. circle. Transfer to a parchment paper-lined baking sheet.
In a small bowl, combine the pie filling, cherries, ginger and cinnamon. Spoon over each pastry to within 2 in. of edges. Fold up edges of pastry over filling, leaving center uncovered. Beat egg white and water; brush over folded pastry. Sprinkle with sugar.
Bake at 400° for 20-25 minutes or until crusts are lightly browned. Using parchment paper, slide tarts onto a wire rack to cool.