1. Pour the juice into a microwave-safe container or a small pot. Mix in the agar powder and let sit for about 5 minutes. Bring the juice to a boil in the microwave or on the stove and boil or simmer for about 1 minute.
2. Dissolve corn starch in the cold water. Stir in dissolved cornstarch and rum or vodka.
3. Pour mixture into about 15 to 18 shot glasses or small cups. Refrigerate at least a few hours to let the jello set. Keep refrigerated until use.
Notes:-The consistency is similar to gelatin-based Jello, but a little softer, which in my opinion slides down your throat easier.-You can easily change the ratio of juice to alcohol to make the shots more or less strong. (I do not recommend making them any stronger though-yuck!)-When taking the shots, keep in mind they are alcohol shots, not yummy desserts, so drink them fast.-Please be a responsible drinker!!!