Ingredients
Method
Preheat oven to 425° and line two 18x13" baking sheets with parchment paper.
Toss 3 medium red plums, apricots, or peaches, pitted, cut into ¼"-thick wedges, ½ tsp. sugar (if using), and a pinch of kosher salt in a medium bowl to coat. Cut 1 sheet frozen puff pastry, thawed according to package directions, into eight equal rectangles and divide between prepared baking sheets; prick all over with a fork. Spread 1 heaping tsp. of 3 Tbsp. jam over each piece of pastry, leaving a ½" border around the edges. Shingle plums on top, overlapping as needed.
Bake tarts, rotating baking sheets back to front and top to bottom halfway through, until edges of pastry are puffed and golden brown, 25–30 minutes.
Drizzle with tarts with honey and sprinkle with flaky salt just before serving. Do Ahead: Tarts can be baked 4 hours ahead. Store, uncovered, at room temperature.
