hmmm i did a search and found this one, it sounds really good.. I might have to try it especially since it says you can freeze it for a few weeks
Quote:
Sweet Watermelon Ice Recipe
Ingredients
3 cups fresh watermelon juice (pureed watermelon (use as much actual watermelon "juice" as possible)
3 Tbsp sugar
2 Tbsp freshly squeezed lemon juice
Instructions
Pour the watermelon juice into a shallow glass baking dish. Add the sugar and lemon juice and stir well. Place the dish in the freezer and chill.
Remove the pan every 1/2 hour and stir. The juice will form light, grainy ice crystals as it freezes. Repeat this process until the juice is fully frozen, about 4 hours, depending on the temperature of your freezer. You can also use an ice cream maker, following the manufacturer's directions.
Serve immediately, or store in the freezer in a covered container up to several weeks.
This recipe makes a refreshing ice that is perfect for hot weather.
Yield: 4 to 6 servings