2 1/4 pounds seeded, cubed watermelon
1 cup superfine sugar
Juice of 1 lemon
½ cup cold water
2 egg whites
Puree three quarters of the watermelon in food processor. Mash remaining watermelon on plate (to give sherbet more texture). Stir sugar, lemon juice, and water in saucepan over very low heat until sugar dissolves and syrup is clear. Mix watermelon puree, mashed watermelon, and syrup mixture in large bowl. Pour into freezer container and freeze for 1 to 1 ½ hours until edges start to set. Beat the mixture and then return to freezer for another hour. Beat egg whites to soft peaks. Beat ice mixture again and fold in egg whites. Return to freezer for one more hour. Beat once more and freeze until firm. Before serving, place sherbet in refrigerator for 20-30 minutes to soften.