This beautiful variation on caramelised puff pastry can be a little challenging to prepare. If the dough gets sticky, just refrigerate it for 10 minutes or so and continue.
Scatter about a third of the sugar on the work surface and place the dough on it. Turn the dough over to coat the other side with sugar and begin to press and roll into a 30cm square. Move the dough frequently while rolling and add sugar under and on top.
Slide the dough onto a baking tray lined with parchment paper and refrigerate for 10-15 minutes until firm.