Ingredients

• 1 (14–17-ounce) package frozen puff pastry, thawed
• 1 cup store-bought caramel sauce, divided
• 5 large apples (preferably a mix of Granny Smith, Gala, and/or Cortland), cored, cut into 1/4" slices (about 2 1/2 pounds)
• 1/2 teaspoon kosher salt

Instructions

1. Arrange a rack in middle of oven; preheat to 400°F. Arrange puff pastry sheets next to each other on parchment so that longer sides are touching. Pinch seam together and gently roll to an 18x13" rectangle. Transfer with parchment to a rimmed baking sheet. Using a sharp knife, lightly score a 1/2" border around pastry (for a decorative border, make small shallow diagonal cuts with a paring knife).
2. Heat caramel in a small bowl in a microwave on high until smooth and pourable, about 30 seconds, or heat in a small pot over medium, stirring occasionally, until smooth and runny, about 5 minutes. Transfer 1 Tbsp. caramel to another small bowl; set aside.
3. Toss apples and salt in a large bowl. Pour remaining caramel over and toss to combine.
4. Arrange apple slices in 4 tight, overlapping rows on pastry, leaving a 1/2" border on all sides. Drizzle with any remaining caramel left in bowl.
5. Bake tart until crust and edges of apples are golden brown, about 35 minutes. Transfer to a wire rack and let cool.
6. Add 1 Tbsp. hot water to reserved caramel in small bowl, whisk to combine, and brush over apples with a pastry brush. Cut into pieces to serve.
7. Do Ahead Tart can be made 6 hours ahead; store uncovered at room temperature and brush with glaze just before serving.
8. Tart can be made 6 hours ahead; store uncovered at room temperature and brush with glaze just before serving.