Let the puff pastry thaw on the counter for about 30-40 minutes. It should still be cold but you should be able to unfold without breaking it.
1 sheet frozen puff pastry
Line a baking sheet with parchment paper.
In a bowl, add in sliced apples, lemon juice, flour, cinnamon, brown sugar, pinch of salt and vanilla extract. Mix gently. Allow to sit for 15 minutes.
2 medium apples, 1 tablespoon all purpose flour, 3 tablespoons brown sugar, ½ teaspoon ground cinnamon, a pinch of salt, 1 teaspoon lemon juice, ½ teaspoon vanilla extract
Once the puff pastry is thawed, lightly flour your surface and place the sheet on top. Using a rolling pin, gently roll the pastry just to smooth creases. Place the puff pastry on the prepared baking sheet.
Using a knife, score about 1 inch border around the sides. Do not cut completely through the dough. Then prick the middle with a fork. Brush the border with egg wash and sprinkle with sanding sugar, if using.
egg wash: 1 egg + 1 tablespoon water, whisked together
Arrange apple slices on top of the pastry (leave the juices behind). Place the tart in the freezer for 10 minutes. This step helps the tart keep its shape. Preheat the oven to 375°F (190°C).
Bake in the preheated oven for about 30-35 minutes, until golden brown.
Let the tart cool down, then brush the top with honey to create a beautiful shine. Serve warm or at room temperature.