In a medium saucepan over medium heat, combine the sugar and water and cook to the fine thread stage. In a medium mixing bowl, beat the egg yolks. While the machine is running, pour the sugar mixture into the egg yolks, mixing until the mixture is cool. Add the coconut extract. In a small bowl, whip the chilled cream and milk together until very firm. Fold the whipped cream into the egg mixture, then slowly fold in the toasted coconut. Pour into a loaf pan and freeze for 6 hours. Just before serving, dip the mold in warm water to slightly loosen it from the sides of the mold. Set a platter on top of the mold and invert. Garnish with more coconut and mint sprigs.