Heat the oven to 350 degrees. In a small bowl, combine the sugar, salt, and pepper. Sprinkle and rub the seasoning on both sides of the ribs until it all adheres. Wrap each rack in a double layer of aluminum foil and place on a rimmed baking sheet. Bake 2 hours and allow to cool in the foil. In a small sauce pan, combine all the ingredients for the glaze. Cook over medium heat for about 10 minutes or until the glaze thickens and coats the back of a spoon. Remove the ribs from the foil and place them on a rimmed baking sheet. Using a pastry brush, coat the ribs with the glaze evenly using about half of the glaze, reserve the remaining glaze. Place the ribs back in the oven and cook for 5 to 10 minutes until the sauce begins to bubble and get sticky. Brush the ribs with the remaining glaze and return to the oven for 5 to 10 minutes. When the ribs are cool enough to handle, portion them into individual ribs and garnish with sesame seeds and scallions. Recipe by Chef Will Gilson