Apple Dumplings with Rich Cinnamon Sauce

1 . Stage

Preheat the oven to 425 degrees F (220 degrees C) and adjust the rack to the lower-middle position. Line a large (at least 18- by 12-inch) baking dish with parchment.

2 . Stage

Mix 3 tablespoons of butter, 1/2 cup of brown sugar, 1 teaspoon of cinnamon, and chopped nuts in a small bowl. Spoon a portion of mixture into each hollowed-out apple core.

3 . Stage

Unroll one dough sheet onto a floured work surface. Pulling on the sides of dough to straighten rounded edges, roll it into an approximate 12-inch square; cut dough into four 6-inch squares and brush the perimeter of each square with egg white. Set apple halves on each square. Bring up 4 corners of dough around apple and pinch edges to seal. Place in prepared baking dish. Brush dumpling tops and sides with egg white; sprinkle with white sugar. Repeat process with remaining apples and dough.

4 . Stage

Bake dumplings in the preheated oven until pastry sets and turns golden brown, about 10 minutes. Reduce heat to 375 degrees F (190 degrees C) and bake until golden brown, about 20 minutes longer.

5 . Stage

Meanwhile, bring 1 cup water, remaining 2 tablespoons butter, remaining 1/2 cup brown sugar, and remaining 1 teaspoon cinnamon to a boil in a small saucepan over medium heat. Dissolve cornstarch in 2 teaspoons water; whisk into hot syrup for a smooth sauce. Cover and keep warm.

6 . Stage

To serve: Spoon a portion of warm sauce on a dessert plate; set apple dumpling on top and serve immediately.