Defrost puff pastry by taking it out of the package and put it on a surface on the counter. Set a timer for 30 minutes.
Preheat oven to 400 degrees Fahrenheit. Line 2 baking sheets with parchment paper.
Combine the sugar and salt. Pour 1 cup of the sugar mixture on a surface or silpat. Put one of the already defrosted puff pastry on top and sprinkle 1/2 cup of the sugar mixture on top. Roll the puff pastry to a 13×13 inch square.
Fold the left edge into the middle and then fold the right edge into the middle. Fold the left edge into the middle and the right edge into the middle. Fold the right edge to meet the left edge.
Slice into 3/8 inch thick slices. Arrange on the baking sheets, cut side up.
Bake for 6 minutes on one side or until the bottom is caramelized. Take them out, flip over and bake them for another 3- 5 minutes. Cool on the baking sheet and transfer to an airtight container.