Pulse freeze-dried raspberries into a powder, sift to remove seeds, and combine with sugar.
Sprinkle regular sugar on one side of the puff pastry, then coat the other side with raspberry sugar and roll it out into a 13 by 14-inch rectangle.
Fold each side halfway toward the middle, add sugar, fold again so edges almost touch, add more sugar on folds, and fold one more time to overlap folds.
Chill in the freezer for about 30 minutes, then slice and bake at 400°F.
After 10 minutes, flip them over and bake for another 4 to 5 minutes until golden brown and crispy.
Optional: Dip in white chocolate before serving.
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