1 sheet frozen puff pastry, thawed
Flour, for dusting
1/2 to 3/4 cup leftover BBQ Sauce 
3 Roma tomatoes, sliced 1/4-inch thick
1 Japanese eggplant, sliced 1/4-inch thick on a mandoline
1 yellow squash, sliced 1/4-inch thick on a mandoline
1 zucchini, sliced 1/4-inch thick on a mandoline
1 to 2 roasted red peppers, julienned
2 to 3 tablespoons olive oil
Kosher salt and freshly cracked black pepper
2 teaspoons chopped fresh basil, divided
Preheat the oven to 400 degrees F. Roll the puff pastry out on a floured surface to a rectangular shape, about 12 by 10 1/2 inches. Transfer the pastry sheet to a parchment-lined baking sheet. With the tines of a fork, dock a 1/2-inch border around the edge of the sheet and dock the center of the sheet a few times as well. This will prevent the dough from rising as it cooks.
Spread the BBQ sauce evenly over the pastry, leaving a small border around the edge of the pastry. Layer the tomatoes, eggplant, yellow squash and zucchini in overlapping rows, or in whatever pattern you like. Sprinkle the roasted red peppers around the tart. Drizzle the assembled tart with a little olive oil, making sure to brush a little on the edges, season with salt and pepper. Bake until the pastry is golden brown and puffed, 20 to 25 minutes. Remove from the oven and immediately sprinkle with the basil before serving.