Special equipment: 8 to 10 small clear glasses, about 4 ounces (1/2 cup) each
Sprinkle 1 tablespoon of the gelatin over the strawberry-banana juice and set aside for 5 minutes. Warm in the microwave for 30 seconds or on the stove to dissolve the gelatin and strain the mixture into a small pitcher. Divide among your serving glasses and chill until set, about 30 minutes. Repeat the process with the purple grape juice, pouring it on top of the strawberry-banana jelly, and chill to set. Repeat the process with the orange juice, chill to set, and serve cold.
Recipe courtesy Gale Gand, Just A Bite by Gale Gand and Julia Moskin: Clarkson N. Potter Publishers, 2001