This is a refreshingly sweet and tangy ice. It's easy to make as well.
Peel mangoes using a vegetable peeler; carefully cut the flesh away from each mango's pit, and roughly chop the flesh. Add the chopped mangoes, lime zest, and lime juice to the jar of a blender.
Add the sugar and 1/4 cup cold water, and puree until the mixture is smooth. Pour the blended mixture into four serving glasses, and place in freezer for 1 hour.
Underripe mangoes should be placed in a paper bag at room temperature; ripe ones can be kept in a plastic bag, refrigerated, for up to 5 days.