Place apples, butter, sugar, vanilla bean, rosemary sprig, and water in a medium pot.
Stir everything together. Bring the mixture to a boil, and simmer over medium heat for about 10 minutes. You want the apples to hold their shape and not become mushy.Remove apples from syrup with a slotted spoon and drain in a colander.
Spread one sheet of puff pastry in a 10-inch pie pan (26-27 cm), taking care to cover the walls as well—cut away the extra puff pastry from the edges.
Spread the apples on top. Cover with the second sheet of puff pastry. Cut pastry exactly to the diameter of the tart pan. Use a fork or your fingers to press down the border to seal and decorate the edges.
Brush the surface lightly with a little of the apple syrup and sprinkle with 1 tbsp sugar. Bake in a preheated oven at 320 ° F for 1 hour.
Nutritional Info – Please keep in mind that the nutritional information provided is only an estimate and can vary based on products used