Preheat oven to 400°F. Line a baking sheet with parchment paper.
On a lightly floured surface, unfold puff pastry and roll into a 15x11-inch rectangle. Transfer to a parchment-lined baking sheet. With a sharp knife, score a rectangle border about 1-inch wide, but do not cut all the way through the dough. Poke the inner rectangle all over with a fork. Trim any uneven edges so that you have a perfect rectangle.
Layer the apple slices, overlapping them slightly. Sprinkle with granulated sugar, then the surface with butter cubes.
Bake for 25 minutes, until crust is golden brown, then transfer to a wire rack. Heat honey in a microwave-safe for 30 seconds, until thin. Drizzle over the tart, then brush it evenly using a pastry brush. Return to oven for 5 minutes, then transfer to a cooling rack. Let cool for at least 10 minutes. Transfer to a cutting board and cut into 8 even pieces. Serve.
