1 Get ready: Put oven rack in lower third of oven and pre-heat oven to 400°F. Butter a large baking sheet (or use Silpat).
2 Make filling: In a medium bowl, mix together apples, currants, and walnuts with the sugar, cinnamon, and corn starch, making sure the fruit and nuts are well coated. Mix in the apple sauce and vanilla.
3a If using puff pastry: Unfold the thawed pastry sheet on a lightly floured surface. Depending on the size of your puff pastry sheet you are going to want to cut the sheet into either four 5-inch-by-5-inch or six 4-inch-by-4-inch squares.
3b If using pie dough: Roll out your pie dough on a lightly floured surface to a 16×11 inch rectangle. Trim the edges to 15×10 inches and cut into six 5×5-inch squares.
4 Add filling to pastry squares: Divide the apple mixture among the squares, leaving a 1-inch border. If…