Preheat oven to 400.

In a small bowl mix sugar with the cinnamon.

Spread half the sugar mixture on a board, lay the puff pastry on top then sprinkle the pastry with the remaining sugar mixture.

With a rolling-pin, roll out the dough slightly to adhere the sugar/cinnamon mixture.

Fold the pastry sheet inward to the middle from both sides, repeat the fold and finally bring the two sides together.

Freeze for 10 minutes (you can refrigerate for 10 minutes if your pastry is still cold).

Cut with a sharp knife into thin slices and place slices cut side up on a parchment lined baking sheet. Sprinkle with additional sugar/cinnamon mixture.

Bake for 18 to 20 minutes.