Watermelon Granita

Combine all ingredients in a food processor/blender. Puree until smooth. Pour into a plastic or glass container and freeze for 1 hour. Rake mixture with fork and freeze for another hour. Check it a few times every hour or so to make sure it is not turning in to a solid block. Rake and freeze. Rake and freeze. Rake and freeze. You get the idea. Rake and serve in cute little cups.