Using a sharp knife, cut along the seed line and remove the flesh just above it. Scrape the seeds from the remaining piece. Seeded watermelon chunks can be frozen to use in watermelon slushes or fruit smoothies. Watermelon sorbet or granita stays fresh in the freezer for up to 3 months. The difference between a sorbet and a granita is in the texture.
Sorbets are smooth, whereas granitas are coarse.
You do not need an ice cream maker to make a granita. The best way to enjoy watermelon is while they are fresh and sweet. When they are gone, they are gone until next summer. Thin watermelon wedges, cut into strips for a garnish Puree watermelon in a food processor. Pour into a 9 x 13 inch baking dish.