Place all of the ingredients in a blender and puree.

Place the puree in an 8×8 inch Pyrex dish and put in the freezer for 1 hour.

Remove from the freezer and scrape with a fork to break up pieces.

Place back into freezer for 1 hour.

Remove from the freezer and scrape with a fork to break up pieces.

Repeat this process one or two more times over several hours until the granita is similar in consistency to shaved ice.

Serve (cover the dish with tin foil to keep the rest in the freezer).