Pour 2 cups cold fruit juice into a medium sized bowl and sprinkle the gelatin powder on top. 

Heat remaining apple juice to boiling. Remove from heat and carefully pour the hot juice over the gelatin and stir until it is all dissolved. 

Pour into a 9 x 13 inch glass baking dish {or mold}. Refrigerate until firm {3-4 hours}. Serve plain or with a little whipped cream on top.