Tomato Watermelon Granita

Place the watermelon, sugar, lemon juice, chopped mint, salt and tomatoes in a blender. Blend on high speed until smooth, about 1 minute. Strain the mixture through a sieve over a large bowl, stirring to push the liquid through. Discard the pulp.

Pour the mixture into a 13-by-9-inch metal baking pan, and cover with plastic wrap. Freeze 4 to 6 hours, scraping the mixture with a spoon every hour to create ice flakes.

Serve cold in small dishes or glasses and garnish with mint leaves, if desired.