Once all of the sugar is incorporated, dust a work surface (counter or large cutting board) with powdered sugar and scrape the candy out onto the work surface. The candy will be very sticky and stiff. Generously dust the top of the ball of candy with powdered sugar, and begin to knead the candy like bread dough: fold the ball of dough over onto itself, then use the heel of your hand to push it down. Give the candy a quarter-turn, and repeat the process, dusting it with more powdered sugar as often as necessary to prevent it from sticking to the board or your hands.
2. Knead until the candy is satiny and not sticky. Once finished, your candy should be entirely smooth.