Put rum, lime juice and sugar into blender or food processor. If using passion fruit, cut in half, scoop out pulp and add to blender. If using guavas, peel, chop and add to blender. If using mangoes, papayas or pepinos, cut in half and scoop flesh (not seeds) into blender. Puree until smooth. (Strain out seeds if using passion fruits.) Add ice to puree. Process until smooth. Taste for sweetness. Pour into glasses and garnish with lime or kiwi. Adapted from a recipe developed by Friedas Finest, a specialty foods purveyor. From the Chicago Tribune 7/8/93.