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["Preheat oven to 400u00b0F. Place apples in a large baking dish and add vinegar, brown sugar, and 3/4 cup water; scrape in seeds from vanilla bean and add pod. Toss to coat apples and roast, turning apples occasionally and adding a splash of water if pan looks dry at any point, until apples are tender and starting to brown and juices are syrupy, 35-40 minutes. Let apples cool in pan; discard vanilla pod. Reduce oven temperature to 375u00b0F.", "Roll out puff pastry on a lightly floured surface to a 14x11"" rectangle. Transfer to a parchment-lined baking sheet, placing a short end nearest to you.", "Roll out almond paste on a lightly floured surface to about a 11x4"" rectangle and place lengthwise on the left-hand side of pastry, leaving a 1 1/2"" border on the left side.", "Arrange apple halves in a single row, slightly overlapping, on top of almond paste and drizzle any pan juices over. Dot apples with butter and fold a long side of pastry up and over apples to create a long rectangle. Using a fork, crimp all open edges firmly to seal; trim crimped sides just enough to tidy edges.", "Whisk egg with 1 tsp. water in a small bowl and brush pastry with egg wash; sprinkle with granulated sugar. Cut several slits in top of the puff pastry to vent. Bake turnover, rotating baking sheet halfway through, until pastry is puffed and deeply browned, 40-45 minutes. Let cool slightly. Serve slices of turnover with scoops of ice cream, if desired.", "Turnover can be baked 1 day ahead. Let cool; store tightly wrapped at room temperature. Reheat in 350u00b0F oven, if desired."]
