All-purpose flour, for dustingRough Puff Pastry Dough (recipe follows)6 tablespoons (72 grams) granulated sugarConfectioners’ sugar, for dustingFlaked sea salt, for sprinkling4 ounces (113 grams) white chocolate, chopped and melted (optional)Gold, silver, and bronze edible luster dust (optional)
On a lightly floured surface, roll Rough Puff Pastry Dough into a 12-inch square. Sprinkle with 3 tablespoons (36 grams) granulated sugar. Using a rolling pin, gently press sugar into dough. Carefully turn dough sugar side down. Sprinkle with remaining 3 tablespoons (36 grams) sugar; using a rolling pin, gently press sugar into dough. Starting on one side, roll up dough into a log. Freeze until firm enough to slice, about 15 minutes.
Line baking sheets with parchment paper. Lightly dust work surface with confectioners’ sugar.
Using a serrated knife, cut dough log into ½-inch-thick slices. On prepared surface, working with one slice at a time, gently roll slices to about ⅛ inch thick and 3 inches wide. (If dough is sticking to rolling pin, lightly dust top with confectioners’ sugar.) Place slices 2 inches apart on prepared pans. Freeze until firm, 10 to 15 minutes.
Preheat oven to 400°F (200°C).
Lightly sprinkle arlettes with sea salt.
Bake, one pan at a time, until bottoms are golden brown, about 8 minutes. Working quickly, gently turn each arlette, maintaining its shape. Bake until puffed and sugar is caramelized, 8 to 10 minutes more. Let cool on pans for 5 minutes. Remove from pans, and let cool completely on wire racks.
For optional white chocolate and luster dust decoration: Using a 1-inch-wide brush, brush melted chocolate onto cookie as desired. Let stand until dry. Using a small dry brush, lightly brush luster dust onto chocolate. Store in an airtight container for up to 2 days.