Dissolve the agar-agar in water, in saucepan combine juice, sugar, and water with agar-agar.
Bring it to boil over medium heat. Stir occasionally making sure agar-agar is mixed well. Let it boil for about 2 minutes.
Remove from the heat pour into individual cups or molds, or in a small glass tray. Refrigerate for about 3-4 hours.
Jello is ready to serve.