In a blender, quickly puree kiwi and sugar. Transfer to a small jar with a tight fitting lid and store in the refrigerator until ready to use. Puree makes enough for about 3 cocktails. Double or triple as needed.

To a cocktail shaker (or a 12 ounce mason jar) add the kiwi puree, lime quarters, and coconut cream. Muddle with a muddler or back of a wooden spoon until the limes are fragrant and have released their juice. Add the coconut and light rums followed by the ice. Close and shake vigorously for 10-15 seconds. Pour into an 8 ounce glass and top with seltzer.