Apple Turnovers

Bahan-bahan (8 porsi)

• 1 package frozen puff pastry (2 sheets, thawed overnight in the refrigerator)
• 2 tablespoons unsalted butter
• 3 cups small-diced Granny smith apples (about 3 medium or 1 1/4 pounds, or a sweet-crisp apple such as gala or Honeycrisp)
• 3 to 4 tablespoons granulated sugar (use the larger amount if using very tart apples, the lesser if using sweeter apples)
• 1/2 teaspoon ground cinnamon
• 1/4 teaspoon ground allspice
• 1/8 teaspoon ground nutmeg (optional)
• 1/8 teaspoon kosher salt
• 1 teaspoon rum (bourbon, brandy, or apple liqueur (optional))
• 1 large egg (beaten with 2 teaspoons water, to create an eggwash)
• 1/2 cup powdered sugar
• 1 tablespoon milk
• 1/4 teaspoon pure vanilla extract