If using unflavored gelatin add 1/4 cup of the fresh orange juice, let mixture bloom for 5 minutes. (Although I used Rasberry jello in this recipe with no juice added to flavored jello.) Unflavored gelatin needs the additional juice therefore add 1/2 more cup of the fresh orange juice into the saucepan. Heat over medium heat and stir with a wooden spoon until gelatin completely dissolved, about 3 to 5 minutes. Then, pour the gelatin mixture into the remaining orange juice, stir to combine. Evenly divide the gelatin-orange juice mixture into the prepared orange cups.