Honeydew Granita

In a blender, working in batches, pulse the melon to a coarse puree. Strain through a fine sieve into another bowl, pressing very lightly on the pulp; discard the pulp. You should have 3 cups of juice. In a small bowl, whisk the sugar with the hot water until dissolved. Stir the sugar syrup into the melon juice along with the lime juice and a generous pinch of salt. Pour the mixture into a 9-by-13-inch metal or glass baking dish and freeze for 1 hour. Using a fork, scrape the granita to form fluffy ice. Continue to freeze and scrape every 30 minutes, until the granita is frozen and fluffy, about 2 hours. Fluff the granita with a fork. Scoop into small glasses, garnish with mint and serve right away.