How To Roll Biscotti Dough The following pictures are here to provide a visual guide in How To Roll Biscotti Dough. Click on an image to enlarge it and read its caption. Decorating biscotti with nuts starts when rolling the dough. Divide your dough into equal halves and form each section into a ball. Using both hands, roll each of the dough balls on a baking sheet into cylinders 8 to 10 inches/20 to 25 centimeters long. Position the dough cylinders parallel to one another lengthwise on a baking sheet. Using the heel of your hand, gently press each cylinder into a 1 inch/2.5 centimeters thick loaf.