The recipe as listed simply does not work. 1/3 a cup of potato will NOT make a pliable dough with 6 cups of sugar. Either expect to use 3 cups of sugar with a lesser yield, or add 2/3 a cup of potato and the other ingredients as listed. Once you have the dough, roll it in the sugar so you can handle it, and cut it in half to roll it out. This will give you a more wieldy product that will easily roll out and cut.