On a lightly floured counter, roll the dough until it’s 3/4-inch (2cm) thick and with a 2 1/2-inch (8cm) biscuit cutter, cut out six individual biscuits, dipping the cutter in flour between cutting each biscuit. You can gather the scraps and re-roll to cut out a few more biscuits. Put the biscuits on the baking sheet evenly spaced apart. Brush just the tops of the biscuits with the glaze, sprinkle generously with extra sugar, and bake until the tops and sides are browned, about 15 minutes. Remove from oven and let cool.