6: ... and wrap tightly in plastic film. Even up the cylinder by rolling with your hands on the worktop until nice and even. Refrigerate for at least 1 hour (this can be made the day before).
7: Preheat the oven to 360°F (180°C). Put 50 g granulated sugar in a rectangular dish.
8: Lightly dampen the sausage of dough and roll in the granulated sugar, pressing to help the crystals stick.
9: Slice the dough into discs 1/4 inch (1/2 cm) thick and arrange on a baking sheet lined with a sheet of cooking parchment.
10: Use a brush to glaze the tops of the biscuits.