Puff pastry "Fir-trees"

Ingredients:

• 2 tablespoons unsalted butter
• 0.5 tsp apple or pumpkin pie spice or gingerbread spice
• 0.5 cup granulated sugar
• 1 sheet of frozen puff pastry, 22 cm (half a 0.5 kg package), thawed
• Premium flour for work
• 1 cup powdered sugar
• 1-2 tablespoons of milk or water
• 1/4 tsp vanilla extract
• Coarse sugar and/or nonpareil sugar, for garnish

Preparation:

1. Position oven racks in the upper and lower thirds of the oven; preheat to 200°C (400°F). Line 2 baking sheets with parchment paper. In a small bowl, combine the butter and spice mixture and microwave until melted. Cool to room temperature.
2. Sprinkle 1/4 cup granulated sugar on a cutting board. Unfold a sheet of puff pastry over the sugar and roll it out into a 25 x 30 cm rectangle. Dust the rolling pin with flour if the dough is sticking. Spread the spiced butter evenly over the entire surface of the dough, then sprinkle the remaining 1/4 cup granulated sugar on top. Roll the dough along the long side into a tight log. Cut the log into 18 slices.
3. Place each circle of dough, cut side down, on a cutting board. Make a slit in each circle, starting from the center of the twist and ending at the edge. Unfold to form a semicircle. You should have four folded strips of dough (the dough will rise to form a Christmas tree during baking). Place nine semicircles on each baking sheet, spacing them 10 cm (4 inches) apart.
4. Bake, rotating the baking sheets halfway through, until the cookies are puffed and golden brown, 18-22 minutes. While they're still warm, gently shape each cookie into a Christmas tree shape with a skewer, if necessary. Cool completely on the baking sheets.
5. Prepare the glazeIn a small bowl, combine the powdered sugar with 1 tablespoon of milk and vanilla extract until smooth. Gradually whisk in up to 1 tablespoon of milk until the icing is thick but pourable. Transfer the icing to a small zip-lock plastic bag and snip off the corner. Pipe the icing onto the cookies. Sprinkle with coarse sugar and/or nonpareils.