In a large mixing bowl add the hot water to the jello, stirring till dissolved. Stir in orange juice. Chill until mixture begins to thicken ( I chill it in a sink half full of ice cubes, about 20 minutes ).
Stir in sour ceam and sherbet, beat until thick and foamy. Fold in pineapple, mandarin orange segments and cherries. Pour into a lightly oiled 2 quart mold.