Roll the puff pastry sheet out into a 40 x 50 cm rectangle.
Sprinkle the pastry with 3 tbsp of granulated sugar
Fold in 1/4 of each side into the middle.
Now fold those two sides on to each other like you're folding a book, then repeat that one more time. (See images in post above.)You'll now have a long puff pastry log.
Slice the log into 1cm slices.
Press the faces of each slice into some granulated sugar and lay them on a baking tray.
Bake for around 20 minutes until deep golden brown and crisp all the way through.