20 cups Juice blend (frozen and reconstituted, not from concentrate or powder), like Pineapple Orange
4 to 6 tablespoon corn starch (Depending on how firm you want it)
Heat the juice blend until it gets reasonably hot on stove. Add the cornstarch and stir until it is blended. When it thickens to something like jelly put it in a dish. Refrigerate for 2 to 3 hours or until firm.